cpython-lru_cache-weakref: Modules/mathmodule.c annotate

annotate Modules/mathmodule.c @ 47927:76325c19af84 legacy-trunk

Document the fact that urllib2 spans multiple modules with new names in Python 3.0.

author	Brett Cannon <bcannon@gmail.com>
date	Fri, 11 Jul 2008 00:12:52 +0000
parents	a7186fee7596
children	b40e13bcb9ea

rev	line source
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	1 /* Math module -- standard C math library functions, pi and e */
fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	2
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	3 /* Here are some comments from Tim Peters, extracted from the
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	4 discussion attached to http://bugs.python.org/issue1640. They
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	5 describe the general aims of the math module with respect to
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	6 special values, IEEE-754 floating-point exceptions, and Python
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	7 exceptions.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	8
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	9 These are the "spirit of 754" rules:
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	10
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	11 1. If the mathematical result is a real number, but of magnitude too
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	12 large to approximate by a machine float, overflow is signaled and the
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	13 result is an infinity (with the appropriate sign).
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	14
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	15 2. If the mathematical result is a real number, but of magnitude too
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	16 small to approximate by a machine float, underflow is signaled and the
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	17 result is a zero (with the appropriate sign).
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	18
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	19 3. At a singularity (a value x such that the limit of f(y) as y
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	20 approaches x exists and is an infinity), "divide by zero" is signaled
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	21 and the result is an infinity (with the appropriate sign). This is
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	22 complicated a little by that the left-side and right-side limits may
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	23 not be the same; e.g., 1/x approaches +inf or -inf as x approaches 0
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	24 from the positive or negative directions. In that specific case, the
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	25 sign of the zero determines the result of 1/0.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	26
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	27 4. At a point where a function has no defined result in the extended
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	28 reals (i.e., the reals plus an infinity or two), invalid operation is
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	29 signaled and a NaN is returned.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	30
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	31 And these are what Python has historically /tried/ to do (but not
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	32 always successfully, as platform libm behavior varies a lot):
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	33
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	34 For #1, raise OverflowError.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	35
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	36 For #2, return a zero (with the appropriate sign if that happens by
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	37 accident ;-)).
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	38
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	39 For #3 and #4, raise ValueError. It may have made sense to raise
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	40 Python's ZeroDivisionError in #3, but historically that's only been
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	41 raised for division by zero and mod by zero.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	42
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	43 */
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	44
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	45 /*
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	46 In general, on an IEEE-754 platform the aim is to follow the C99
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	47 standard, including Annex 'F', whenever possible. Where the
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	48 standard recommends raising the 'divide-by-zero' or 'invalid'
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	49 floating-point exceptions, Python should raise a ValueError. Where
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	50 the standard recommends raising 'overflow', Python should raise an
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	51 OverflowError. In all other circumstances a value should be
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	52 returned.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	53 */
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	54
4635 49745ddb4f69 Renamed Barry Warsaw <barry@python.org> parents: 4503 diff changeset	55 #include "Python.h"
34872 0143d990d60c Make that a C, not a C++, comment. Michael W. Hudson <mwh@python.net> parents: 34871 diff changeset	56 #include "longintrepr.h" /* just for SHIFT */
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	57
44940 12099143724f Add prototypes to get the mathmodule.c to compile on OSF1 5.1 (Tru64) Neal Norwitz <nnorwitz@gmail.com> parents: 44488 diff changeset	58 #ifdef _OSF_SOURCE
12099143724f Add prototypes to get the mathmodule.c to compile on OSF1 5.1 (Tru64) Neal Norwitz <nnorwitz@gmail.com> parents: 44488 diff changeset	59 /* OSF1 5.1 doesn't make this available with XOPEN_SOURCE_EXTENDED defined */
12099143724f Add prototypes to get the mathmodule.c to compile on OSF1 5.1 (Tru64) Neal Norwitz <nnorwitz@gmail.com> parents: 44488 diff changeset	60 extern double copysign(double, double);
12099143724f Add prototypes to get the mathmodule.c to compile on OSF1 5.1 (Tru64) Neal Norwitz <nnorwitz@gmail.com> parents: 44488 diff changeset	61 #endif
12099143724f Add prototypes to get the mathmodule.c to compile on OSF1 5.1 (Tru64) Neal Norwitz <nnorwitz@gmail.com> parents: 44488 diff changeset	62
15170 09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	63 /* Call is_error when errno != 0, and where x is the result libm
09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	64 * returned. is_error will usually set up an exception and return
09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	65 * true (1), but may return false (0) without setting up an exception.
09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	66 */
09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	67 static int
09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	68 is_error(double x)
498 56bb1067a880 Improve error handling. Guido van Rossum <guido@python.org> parents: 438 diff changeset	69 {
15170 09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	70 int result = 1; /* presumption of guilt */
15181 2ed358446f2f Repaired a comment and asserted a precondition. Tim Peters <tim.peters@gmail.com> parents: 15170 diff changeset	71 assert(errno); /* non-zero errno is a precondition for calling */
498 56bb1067a880 Improve error handling. Guido van Rossum <guido@python.org> parents: 438 diff changeset	72 if (errno == EDOM)
4635 49745ddb4f69 Renamed Barry Warsaw <barry@python.org> parents: 4503 diff changeset	73 PyErr_SetString(PyExc_ValueError, "math domain error");
19750 35b6a1d0b1e0 Rework the way we try to check for libm overflow, given that C99 no longer Tim Peters <tim.peters@gmail.com> parents: 19730 diff changeset	74
15170 09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	75 else if (errno == ERANGE) {
09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	76 /* ANSI C generally requires libm functions to set ERANGE
09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	77 * on overflow, but also generally allows them to set
09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	78 * ERANGE on underflow too. There's no consistency about
19750 35b6a1d0b1e0 Rework the way we try to check for libm overflow, given that C99 no longer Tim Peters <tim.peters@gmail.com> parents: 19730 diff changeset	79 * the latter across platforms.
35b6a1d0b1e0 Rework the way we try to check for libm overflow, given that C99 no longer Tim Peters <tim.peters@gmail.com> parents: 19730 diff changeset	80 * Alas, C99 never requires that errno be set.
35b6a1d0b1e0 Rework the way we try to check for libm overflow, given that C99 no longer Tim Peters <tim.peters@gmail.com> parents: 19730 diff changeset	81 * Here we suppress the underflow errors (libm functions
35b6a1d0b1e0 Rework the way we try to check for libm overflow, given that C99 no longer Tim Peters <tim.peters@gmail.com> parents: 19730 diff changeset	82 * should return a zero on underflow, and +- HUGE_VAL on
35b6a1d0b1e0 Rework the way we try to check for libm overflow, given that C99 no longer Tim Peters <tim.peters@gmail.com> parents: 19730 diff changeset	83 * overflow, so testing the result for zero suffices to
35b6a1d0b1e0 Rework the way we try to check for libm overflow, given that C99 no longer Tim Peters <tim.peters@gmail.com> parents: 19730 diff changeset	84 * distinguish the cases).
47752 ca074232b879 Issue 3118: make test_math pass on Ubuntu/ia64. exp(-745.0) was raising Mark Dickinson <dickinsm@gmail.com> parents: 47532 diff changeset	85 *
ca074232b879 Issue 3118: make test_math pass on Ubuntu/ia64. exp(-745.0) was raising Mark Dickinson <dickinsm@gmail.com> parents: 47532 diff changeset	86 * On some platforms (Ubuntu/ia64) it seems that errno can be
ca074232b879 Issue 3118: make test_math pass on Ubuntu/ia64. exp(-745.0) was raising Mark Dickinson <dickinsm@gmail.com> parents: 47532 diff changeset	87 * set to ERANGE for subnormal results that do not underflow
ca074232b879 Issue 3118: make test_math pass on Ubuntu/ia64. exp(-745.0) was raising Mark Dickinson <dickinsm@gmail.com> parents: 47532 diff changeset	88 * to zero. So to be safe, we'll ignore ERANGE whenever the
ca074232b879 Issue 3118: make test_math pass on Ubuntu/ia64. exp(-745.0) was raising Mark Dickinson <dickinsm@gmail.com> parents: 47532 diff changeset	89 * function result is less than one in absolute value.
15170 09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	90 */
47752 ca074232b879 Issue 3118: make test_math pass on Ubuntu/ia64. exp(-745.0) was raising Mark Dickinson <dickinsm@gmail.com> parents: 47532 diff changeset	91 if (fabs(x) < 1.0)
ca074232b879 Issue 3118: make test_math pass on Ubuntu/ia64. exp(-745.0) was raising Mark Dickinson <dickinsm@gmail.com> parents: 47532 diff changeset	92 result = 0;
ca074232b879 Issue 3118: make test_math pass on Ubuntu/ia64. exp(-745.0) was raising Mark Dickinson <dickinsm@gmail.com> parents: 47532 diff changeset	93 else
19048 e282d6b2b758 Part of SF patch [#431848] mathmodule.c: doc strings & conversion, from Tim Peters <tim.peters@gmail.com> parents: 18066 diff changeset	94 PyErr_SetString(PyExc_OverflowError,
15170 09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	95 "math range error");
09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	96 }
498 56bb1067a880 Improve error handling. Guido van Rossum <guido@python.org> parents: 438 diff changeset	97 else
4635 49745ddb4f69 Renamed Barry Warsaw <barry@python.org> parents: 4503 diff changeset	98 /* Unexpected math error */
49745ddb4f69 Renamed Barry Warsaw <barry@python.org> parents: 4503 diff changeset	99 PyErr_SetFromErrno(PyExc_ValueError);
15170 09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	100 return result;
498 56bb1067a880 Improve error handling. Guido van Rossum <guido@python.org> parents: 438 diff changeset	101 }
56bb1067a880 Improve error handling. Guido van Rossum <guido@python.org> parents: 438 diff changeset	102
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	103 /*
46507 022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	104 wrapper for atan2 that deals directly with special cases before
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	105 delegating to the platform libm for the remaining cases. This
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	106 is necessary to get consistent behaviour across platforms.
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	107 Windows, FreeBSD and alpha Tru64 are amongst platforms that don't
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	108 always follow C99.
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	109 */
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	110
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	111 static double
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	112 m_atan2(double y, double x)
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	113 {
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	114 if (Py_IS_NAN(x) \|\| Py_IS_NAN(y))
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	115 return Py_NAN;
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	116 if (Py_IS_INFINITY(y)) {
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	117 if (Py_IS_INFINITY(x)) {
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	118 if (copysign(1., x) == 1.)
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	119 /* atan2(+-inf, +inf) == +-pi/4 */
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	120 return copysign(0.25*Py_MATH_PI, y);
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	121 else
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	122 /* atan2(+-inf, -inf) == +-pi3/4 /
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	123 return copysign(0.75*Py_MATH_PI, y);
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	124 }
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	125 /* atan2(+-inf, x) == +-pi/2 for finite x */
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	126 return copysign(0.5*Py_MATH_PI, y);
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	127 }
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	128 if (Py_IS_INFINITY(x) \|\| y == 0.) {
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	129 if (copysign(1., x) == 1.)
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	130 /* atan2(+-y, +inf) = atan2(+-0, +x) = +-0. */
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	131 return copysign(0., y);
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	132 else
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	133 /* atan2(+-y, -inf) = atan2(+-0., -x) = +-pi. */
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	134 return copysign(Py_MATH_PI, y);
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	135 }
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	136 return atan2(y, x);
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	137 }
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	138
022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	139 /*
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	140 math_1 is used to wrap a libm function f that takes a double
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	141 arguments and returns a double.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	142
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	143 The error reporting follows these rules, which are designed to do
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	144 the right thing on C89/C99 platforms and IEEE 754/non IEEE 754
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	145 platforms.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	146
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	147 - a NaN result from non-NaN inputs causes ValueError to be raised
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	148 - an infinite result from finite inputs causes OverflowError to be
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	149 raised if can_overflow is 1, or raises ValueError if can_overflow
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	150 is 0.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	151 - if the result is finite and errno == EDOM then ValueError is
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	152 raised
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	153 - if the result is finite and nonzero and errno == ERANGE then
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	154 OverflowError is raised
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	155
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	156 The last rule is used to catch overflow on platforms which follow
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	157 C89 but for which HUGE_VAL is not an infinity.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	158
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	159 For the majority of one-argument functions these rules are enough
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	160 to ensure that Python's functions behave as specified in 'Annex F'
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	161 of the C99 standard, with the 'invalid' and 'divide-by-zero'
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	162 floating-point exceptions mapping to Python's ValueError and the
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	163 'overflow' floating-point exception mapping to OverflowError.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	164 math_1 only works for functions that don't have singularities and
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	165 the possibility of overflow; fortunately, that covers everything we
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	166 care about right now.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	167 */
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	168
4635 49745ddb4f69 Renamed Barry Warsaw <barry@python.org> parents: 4503 diff changeset	169 static PyObject *
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	170 math_1(PyObject arg, double (func) (double), int can_overflow)
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	171 {
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	172 double x, r;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	173 x = PyFloat_AsDouble(arg);
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	174 if (x == -1.0 && PyErr_Occurred())
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	175 return NULL;
fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	176 errno = 0;
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	177 PyFPE_START_PROTECT("in math_1", return 0);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	178 r = (*func)(x);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	179 PyFPE_END_PROTECT(r);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	180 if (Py_IS_NAN(r)) {
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	181 if (!Py_IS_NAN(x))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	182 errno = EDOM;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	183 else
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	184 errno = 0;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	185 }
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	186 else if (Py_IS_INFINITY(r)) {
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	187 if (Py_IS_FINITE(x))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	188 errno = can_overflow ? ERANGE : EDOM;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	189 else
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	190 errno = 0;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	191 }
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	192 if (errno && is_error(r))
15170 09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	193 return NULL;
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	194 else
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	195 return PyFloat_FromDouble(r);
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	196 }
fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	197
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	198 /*
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	199 math_2 is used to wrap a libm function f that takes two double
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	200 arguments and returns a double.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	201
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	202 The error reporting follows these rules, which are designed to do
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	203 the right thing on C89/C99 platforms and IEEE 754/non IEEE 754
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	204 platforms.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	205
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	206 - a NaN result from non-NaN inputs causes ValueError to be raised
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	207 - an infinite result from finite inputs causes OverflowError to be
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	208 raised.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	209 - if the result is finite and errno == EDOM then ValueError is
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	210 raised
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	211 - if the result is finite and nonzero and errno == ERANGE then
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	212 OverflowError is raised
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	213
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	214 The last rule is used to catch overflow on platforms which follow
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	215 C89 but for which HUGE_VAL is not an infinity.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	216
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	217 For most two-argument functions (copysign, fmod, hypot, atan2)
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	218 these rules are enough to ensure that Python's functions behave as
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	219 specified in 'Annex F' of the C99 standard, with the 'invalid' and
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	220 'divide-by-zero' floating-point exceptions mapping to Python's
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	221 ValueError and the 'overflow' floating-point exception mapping to
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	222 OverflowError.
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	223 */
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	224
4635 49745ddb4f69 Renamed Barry Warsaw <barry@python.org> parents: 4503 diff changeset	225 static PyObject *
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	226 math_2(PyObject args, double (func) (double, double), char *funcname)
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	227 {
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	228 PyObject ox, oy;
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	229 double x, y, r;
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	230 if (! PyArg_UnpackTuple(args, funcname, 2, 2, &ox, &oy))
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	231 return NULL;
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	232 x = PyFloat_AsDouble(ox);
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	233 y = PyFloat_AsDouble(oy);
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	234 if ((x == -1.0 \|\| y == -1.0) && PyErr_Occurred())
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	235 return NULL;
fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	236 errno = 0;
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	237 PyFPE_START_PROTECT("in math_2", return 0);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	238 r = (*func)(x, y);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	239 PyFPE_END_PROTECT(r);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	240 if (Py_IS_NAN(r)) {
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	241 if (!Py_IS_NAN(x) && !Py_IS_NAN(y))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	242 errno = EDOM;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	243 else
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	244 errno = 0;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	245 }
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	246 else if (Py_IS_INFINITY(r)) {
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	247 if (Py_IS_FINITE(x) && Py_IS_FINITE(y))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	248 errno = ERANGE;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	249 else
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	250 errno = 0;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	251 }
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	252 if (errno && is_error(r))
15170 09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	253 return NULL;
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	254 else
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	255 return PyFloat_FromDouble(r);
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	256 }
fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	257
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	258 #define FUNC1(funcname, func, can_overflow, docstring) \
13326 24717405dd89 ANSI-fication, remove Py_PROTO, etc. Fred Drake <fdrake@acm.org> parents: 13309 diff changeset	259 static PyObject * math_##funcname(PyObject self, PyObject args) { \
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	260 return math_1(args, func, can_overflow); \
9593 f22f769bf3d9 Added Doc strings -- by Chris Petrilli. Guido van Rossum <guido@python.org> parents: 9588 diff changeset	261 }\
23832 ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	262 PyDoc_STRVAR(math_##funcname##_doc, docstring);
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	263
13326 24717405dd89 ANSI-fication, remove Py_PROTO, etc. Fred Drake <fdrake@acm.org> parents: 13309 diff changeset	264 #define FUNC2(funcname, func, docstring) \
24717405dd89 ANSI-fication, remove Py_PROTO, etc. Fred Drake <fdrake@acm.org> parents: 13309 diff changeset	265 static PyObject * math_##funcname(PyObject self, PyObject args) { \
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	266 return math_2(args, func, #funcname); \
9593 f22f769bf3d9 Added Doc strings -- by Chris Petrilli. Guido van Rossum <guido@python.org> parents: 9588 diff changeset	267 }\
23832 ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	268 PyDoc_STRVAR(math_##funcname##_doc, docstring);
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	269
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	270 FUNC1(acos, acos, 0,
19048 e282d6b2b758 Part of SF patch [#431848] mathmodule.c: doc strings & conversion, from Tim Peters <tim.peters@gmail.com> parents: 18066 diff changeset	271 "acos(x)\n\nReturn the arc cosine (measured in radians) of x.")
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	272 FUNC1(acosh, acosh, 0,
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	273 "acosh(x)\n\nReturn the hyperbolic arc cosine (measured in radians) of x.")
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	274 FUNC1(asin, asin, 0,
19048 e282d6b2b758 Part of SF patch [#431848] mathmodule.c: doc strings & conversion, from Tim Peters <tim.peters@gmail.com> parents: 18066 diff changeset	275 "asin(x)\n\nReturn the arc sine (measured in radians) of x.")
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	276 FUNC1(asinh, asinh, 0,
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	277 "asinh(x)\n\nReturn the hyperbolic arc sine (measured in radians) of x.")
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	278 FUNC1(atan, atan, 0,
19048 e282d6b2b758 Part of SF patch [#431848] mathmodule.c: doc strings & conversion, from Tim Peters <tim.peters@gmail.com> parents: 18066 diff changeset	279 "atan(x)\n\nReturn the arc tangent (measured in radians) of x.")
46507 022296032d8f math.atan2 is misbehaving on Windows; this patch Mark Dickinson <dickinsm@gmail.com> parents: 46500 diff changeset	280 FUNC2(atan2, m_atan2,
19048 e282d6b2b758 Part of SF patch [#431848] mathmodule.c: doc strings & conversion, from Tim Peters <tim.peters@gmail.com> parents: 18066 diff changeset	281 "atan2(y, x)\n\nReturn the arc tangent (measured in radians) of y/x.\n"
e282d6b2b758 Part of SF patch [#431848] mathmodule.c: doc strings & conversion, from Tim Peters <tim.peters@gmail.com> parents: 18066 diff changeset	282 "Unlike atan(y/x), the signs of both x and y are considered.")
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	283 FUNC1(atanh, atanh, 0,
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	284 "atanh(x)\n\nReturn the hyperbolic arc tangent (measured in radians) of x.")
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	285 FUNC1(ceil, ceil, 0,
44488 94eeaeeb3ce9 Continue rolling back pep-3141 changes that changed behavior from 2.5. This Jeffrey Yasskin <jyasskin@gmail.com> parents: 44453 diff changeset	286 "ceil(x)\n\nReturn the ceiling of x as a float.\n"
94eeaeeb3ce9 Continue rolling back pep-3141 changes that changed behavior from 2.5. This Jeffrey Yasskin <jyasskin@gmail.com> parents: 44453 diff changeset	287 "This is the smallest integral value >= x.")
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	288 FUNC2(copysign, copysign,
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	289 "copysign(x,y)\n\nReturn x with the sign of y.")
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	290 FUNC1(cos, cos, 0,
19048 e282d6b2b758 Part of SF patch [#431848] mathmodule.c: doc strings & conversion, from Tim Peters <tim.peters@gmail.com> parents: 18066 diff changeset	291 "cos(x)\n\nReturn the cosine of x (measured in radians).")
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	292 FUNC1(cosh, cosh, 1,
9593 f22f769bf3d9 Added Doc strings -- by Chris Petrilli. Guido van Rossum <guido@python.org> parents: 9588 diff changeset	293 "cosh(x)\n\nReturn the hyperbolic cosine of x.")
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	294 FUNC1(exp, exp, 1,
9593 f22f769bf3d9 Added Doc strings -- by Chris Petrilli. Guido van Rossum <guido@python.org> parents: 9588 diff changeset	295 "exp(x)\n\nReturn e raised to the power of x.")
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	296 FUNC1(fabs, fabs, 0,
19048 e282d6b2b758 Part of SF patch [#431848] mathmodule.c: doc strings & conversion, from Tim Peters <tim.peters@gmail.com> parents: 18066 diff changeset	297 "fabs(x)\n\nReturn the absolute value of the float x.")
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	298 FUNC1(floor, floor, 0,
44488 94eeaeeb3ce9 Continue rolling back pep-3141 changes that changed behavior from 2.5. This Jeffrey Yasskin <jyasskin@gmail.com> parents: 44453 diff changeset	299 "floor(x)\n\nReturn the floor of x as a float.\n"
94eeaeeb3ce9 Continue rolling back pep-3141 changes that changed behavior from 2.5. This Jeffrey Yasskin <jyasskin@gmail.com> parents: 44453 diff changeset	300 "This is the largest integral value <= x.")
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	301 FUNC1(log1p, log1p, 1,
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	302 "log1p(x)\n\nReturn the natural logarithm of 1+x (base e).\n\
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	303 The result is computed in a way which is accurate for x near zero.")
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	304 FUNC1(sin, sin, 0,
19048 e282d6b2b758 Part of SF patch [#431848] mathmodule.c: doc strings & conversion, from Tim Peters <tim.peters@gmail.com> parents: 18066 diff changeset	305 "sin(x)\n\nReturn the sine of x (measured in radians).")
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	306 FUNC1(sinh, sinh, 1,
9593 f22f769bf3d9 Added Doc strings -- by Chris Petrilli. Guido van Rossum <guido@python.org> parents: 9588 diff changeset	307 "sinh(x)\n\nReturn the hyperbolic sine of x.")
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	308 FUNC1(sqrt, sqrt, 0,
9593 f22f769bf3d9 Added Doc strings -- by Chris Petrilli. Guido van Rossum <guido@python.org> parents: 9588 diff changeset	309 "sqrt(x)\n\nReturn the square root of x.")
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	310 FUNC1(tan, tan, 0,
19048 e282d6b2b758 Part of SF patch [#431848] mathmodule.c: doc strings & conversion, from Tim Peters <tim.peters@gmail.com> parents: 18066 diff changeset	311 "tan(x)\n\nReturn the tangent of x (measured in radians).")
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	312 FUNC1(tanh, tanh, 0,
9593 f22f769bf3d9 Added Doc strings -- by Chris Petrilli. Guido van Rossum <guido@python.org> parents: 9588 diff changeset	313 "tanh(x)\n\nReturn the hyperbolic tangent of x.")
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	314
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	315 /* Precision summation function as msum() by Raymond Hettinger in
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	316 <http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/393090>,
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	317 enhanced with the exact partials sum and roundoff from Mark
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	318 Dickinson's post at <http://bugs.python.org/file10357/msum4.py>.
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	319 See those links for more details, proofs and other references.
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	320
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	321 Note 1: IEEE 754R floating point semantics are assumed,
71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	322 but the current implementation does not re-establish special
71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	323 value semantics across iterations (i.e. handling -Inf + Inf).
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	324
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	325 Note 2: No provision is made for intermediate overflow handling;
47370 9e6e6b817f32 Fix two typos. Raymond Hettinger <python@rcn.com> parents: 47220 diff changeset	326 therefore, sum([1e+308, 1e-308, 1e+308]) returns 1e+308 while
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	327 sum([1e+308, 1e+308, 1e-308]) raises an OverflowError due to the
71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	328 overflow of the first partial sum.
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	329
47777 c39263e94c33 Fix comment typos Andrew M. Kuchling <amk@amk.ca> parents: 47757 diff changeset	330 Note 3: The intermediate values lo, yr, and hi are declared volatile so
47783 a7186fee7596 Fix another typo in math_sum comment Mark Dickinson <dickinsm@gmail.com> parents: 47777 diff changeset	331 aggressive compilers won't algebraically reduce lo to always be exactly 0.0.
47532 6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	332 Also, the volatile declaration forces the values to be stored in memory as
6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	333 regular doubles instead of extended long precision (80-bit) values. This
47777 c39263e94c33 Fix comment typos Andrew M. Kuchling <amk@amk.ca> parents: 47757 diff changeset	334 prevents double rounding because any addition or subtraction of two doubles
47532 6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	335 can be resolved exactly into double-sized hi and lo values. As long as the
6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	336 hi value gets forced into a double before yr and lo are computed, the extra
6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	337 bits in downstream extended precision operations (x87 for example) will be
6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	338 exactly zero and therefore can be losslessly stored back into a double,
6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	339 thereby preventing double rounding.
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	340
47532 6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	341 Note 4: A similar implementation is in Modules/cmathmodule.c.
6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	342 Be sure to update both when making changes.
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	343
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	344 Note 5: The signature of math.sum() differs from __builtin__.sum()
71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	345 because the start argument doesn't make sense in the context of
71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	346 accurate summation. Since the partials table is collapsed before
71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	347 returning a result, sum(seq2, start=sum(seq1)) may not equal the
71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	348 accurate result returned by sum(itertools.chain(seq1, seq2)).
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	349 */
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	350
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	351 #define NUM_PARTIALS 32 /* initial partials array size, on stack */
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	352
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	353 /* Extend the partials array p[] by doubling its size. */
71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	354 static int /* non-zero on error */
47532 6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	355 _sum_realloc(double **p_ptr, Py_ssize_t n,
6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	356 double ps, Py_ssize_t m_ptr)
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	357 {
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	358 void *v = NULL;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	359 Py_ssize_t m = *m_ptr;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	360
47532 6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	361 m += m; /* double */
6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	362 if (n < m && m < (PY_SSIZE_T_MAX / sizeof(double))) {
6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	363 double p = p_ptr;
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	364 if (p == ps) {
47532 6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	365 v = PyMem_Malloc(sizeof(double) * m);
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	366 if (v != NULL)
47532 6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	367 memcpy(v, ps, sizeof(double) * n);
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	368 }
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	369 else
47532 6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	370 v = PyMem_Realloc(p, sizeof(double) * m);
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	371 }
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	372 if (v == NULL) { /* size overflow or no memory */
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	373 PyErr_SetString(PyExc_MemoryError, "math sum partials");
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	374 return 1;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	375 }
47532 6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	376 p_ptr = (double) v;
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	377 *m_ptr = m;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	378 return 0;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	379 }
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	380
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	381 /* Full precision summation of a sequence of floats.
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	382
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	383 def msum(iterable):
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	384 partials = [] # sorted, non-overlapping partial sums
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	385 for x in iterable:
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	386 i = 0
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	387 for y in partials:
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	388 if abs(x) < abs(y):
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	389 x, y = y, x
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	390 hi = x + y
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	391 lo = y - (hi - x)
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	392 if lo:
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	393 partials[i] = lo
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	394 i += 1
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	395 x = hi
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	396 partials[i:] = [x]
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	397 return sum_exact(partials)
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	398
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	399 Rounded x+y stored in hi with the roundoff stored in lo. Together hi+lo
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	400 are exactly equal to x+y. The inner loop applies hi/lo summation to each
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	401 partial so that the list of partial sums remains exact.
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	402
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	403 Sum_exact() adds the partial sums exactly and correctly rounds the final
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	404 result (using the round-half-to-even rule). The items in partials remain
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	405 non-zero, non-special, non-overlapping and strictly increasing in
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	406 magnitude, but possibly not all having the same sign.
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	407
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	408 Depends on IEEE 754 arithmetic guarantees and half-even rounding.
71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	409 */
71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	410
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	411 static PyObject*
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	412 math_sum(PyObject self, PyObject seq)
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	413 {
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	414 PyObject item, iter, *sum = NULL;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	415 Py_ssize_t i, j, n = 0, m = NUM_PARTIALS;
47532 6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	416 double x, y, t, ps[NUM_PARTIALS], *p = ps;
6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	417 volatile double hi, yr, lo;
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	418
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	419 iter = PyObject_GetIter(seq);
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	420 if (iter == NULL)
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	421 return NULL;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	422
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	423 PyFPE_START_PROTECT("sum", Py_DECREF(iter); return NULL)
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	424
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	425 for(;;) { /* for x in iterable */
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	426 assert(0 <= n && n <= m);
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	427 assert((m == NUM_PARTIALS && p == ps) \|\|
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	428 (m > NUM_PARTIALS && p != NULL));
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	429
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	430 item = PyIter_Next(iter);
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	431 if (item == NULL) {
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	432 if (PyErr_Occurred())
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	433 goto _sum_error;
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	434 break;
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	435 }
47532 6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	436 x = PyFloat_AsDouble(item);
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	437 Py_DECREF(item);
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	438 if (PyErr_Occurred())
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	439 goto _sum_error;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	440
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	441 for (i = j = 0; j < n; j++) { /* for y in partials */
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	442 y = p[j];
47395 bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	443 if (fabs(x) < fabs(y)) {
bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	444 t = x; x = y; y = t;
bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	445 }
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	446 hi = x + y;
47395 bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	447 yr = hi - x;
bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	448 lo = y - yr;
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	449 if (lo != 0.0)
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	450 p[i++] = lo;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	451 x = hi;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	452 }
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	453
71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	454 n = i; /* ps[i:] = [x] */
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	455 if (x != 0.0) {
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	456 /* If non-finite, reset partials, effectively
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	457 adding subsequent items without roundoff
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	458 and yielding correct non-finite results,
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	459 provided IEEE 754 rules are observed */
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	460 if (! Py_IS_FINITE(x))
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	461 n = 0;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	462 else if (n >= m && _sum_realloc(&p, n, ps, &m))
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	463 goto _sum_error;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	464 p[n++] = x;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	465 }
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	466 }
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	467
47395 bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	468 hi = 0.0;
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	469 if (n > 0) {
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	470 hi = p[--n];
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	471 if (Py_IS_FINITE(hi)) {
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	472 /* sum_exact(ps, hi) from the top, stop when the sum becomes inexact. */
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	473 while (n > 0) {
47395 bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	474 x = hi;
bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	475 y = p[--n];
bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	476 assert(fabs(y) < fabs(x));
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	477 hi = x + y;
47395 bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	478 yr = hi - x;
bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	479 lo = y - yr;
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	480 if (lo != 0.0)
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	481 break;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	482 }
47395 bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	483 /* Make half-even rounding work across multiple partials. Needed
bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	484 so that sum([1e-16, 1, 1e16]) will round-up the last digit to
bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	485 two instead of down to zero (the 1e-16 makes the 1 slightly
bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	486 closer to two). With a potential 1 ULP rounding error fixed-up,
bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	487 math.sum() can guarantee commutativity. */
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	488 if (n > 0 && ((lo < 0.0 && p[n-1] < 0.0) \|\|
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	489 (lo > 0.0 && p[n-1] > 0.0))) {
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	490 y = lo * 2.0;
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	491 x = hi + y;
47395 bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	492 yr = x - hi;
bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	493 if (y == yr)
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	494 hi = x;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	495 }
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	496 }
47395 bba29f462bcc * Mark intermedidate computes values (hi, lo, yr) as volatile. Raymond Hettinger <python@rcn.com> parents: 47370 diff changeset	497 else { /* raise exception corresponding to a special value */
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	498 errno = Py_IS_NAN(hi) ? EDOM : ERANGE;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	499 if (is_error(hi))
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	500 goto _sum_error;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	501 }
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	502 }
47532 6cfa297c6555 Unhappy buildbots. Revert 64052. Long doubles have unexpected effects on some builds. Raymond Hettinger <python@rcn.com> parents: 47531 diff changeset	503 sum = PyFloat_FromDouble(hi);
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	504
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	505 _sum_error:
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	506 PyFPE_END_PROTECT(hi)
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	507 Py_DECREF(iter);
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	508 if (p != ps)
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	509 PyMem_Free(p);
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	510 return sum;
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	511 }
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	512
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	513 #undef NUM_PARTIALS
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	514
2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	515 PyDoc_STRVAR(math_sum_doc,
47220 71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	516 "sum(iterable)\n\n\
71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	517 Return an accurate floating point sum of values in the iterable.\n\
71deee6b941e Tweak the comments and formatting. Raymond Hettinger <python@rcn.com> parents: 47216 diff changeset	518 Assumes IEEE-754 floating point arithmetic.");
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	519
47529 6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	520 static PyObject *
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	521 math_factorial(PyObject self, PyObject arg)
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	522 {
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	523 long i, x;
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	524 PyObject result, iobj, *newresult;
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	525
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	526 if (PyFloat_Check(arg)) {
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	527 double dx = PyFloat_AS_DOUBLE((PyFloatObject *)arg);
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	528 if (dx != floor(dx)) {
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	529 PyErr_SetString(PyExc_ValueError,
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	530 "factorial() only accepts integral values");
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	531 return NULL;
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	532 }
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	533 }
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	534
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	535 x = PyInt_AsLong(arg);
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	536 if (x == -1 && PyErr_Occurred())
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	537 return NULL;
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	538 if (x < 0) {
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	539 PyErr_SetString(PyExc_ValueError,
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	540 "factorial() not defined for negative values");
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	541 return NULL;
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	542 }
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	543
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	544 result = (PyObject *)PyInt_FromLong(1);
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	545 if (result == NULL)
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	546 return NULL;
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	547 for (i=1 ; i<=x ; i++) {
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	548 iobj = (PyObject *)PyInt_FromLong(i);
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	549 if (iobj == NULL)
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	550 goto error;
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	551 newresult = PyNumber_Multiply(result, iobj);
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	552 Py_DECREF(iobj);
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	553 if (newresult == NULL)
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	554 goto error;
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	555 Py_DECREF(result);
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	556 result = newresult;
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	557 }
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	558 return result;
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	559
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	560 error:
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	561 Py_DECREF(result);
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	562 return NULL;
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	563 }
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	564
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	565 PyDoc_STRVAR(math_factorial_doc, "Return n!");
6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	566
4635 49745ddb4f69 Renamed Barry Warsaw <barry@python.org> parents: 4503 diff changeset	567 static PyObject *
45079 492b302aded6 Move __builtins__.trunc() to math.trunc() per Jeffrey Yasskin <jyasskin@gmail.com> parents: 44947 diff changeset	568 math_trunc(PyObject self, PyObject number)
492b302aded6 Move __builtins__.trunc() to math.trunc() per Jeffrey Yasskin <jyasskin@gmail.com> parents: 44947 diff changeset	569 {
492b302aded6 Move __builtins__.trunc() to math.trunc() per Jeffrey Yasskin <jyasskin@gmail.com> parents: 44947 diff changeset	570 return PyObject_CallMethod(number, "__trunc__", NULL);
492b302aded6 Move __builtins__.trunc() to math.trunc() per Jeffrey Yasskin <jyasskin@gmail.com> parents: 44947 diff changeset	571 }
492b302aded6 Move __builtins__.trunc() to math.trunc() per Jeffrey Yasskin <jyasskin@gmail.com> parents: 44947 diff changeset	572
492b302aded6 Move __builtins__.trunc() to math.trunc() per Jeffrey Yasskin <jyasskin@gmail.com> parents: 44947 diff changeset	573 PyDoc_STRVAR(math_trunc_doc,
492b302aded6 Move __builtins__.trunc() to math.trunc() per Jeffrey Yasskin <jyasskin@gmail.com> parents: 44947 diff changeset	574 "trunc(x:Real) -> Integral\n"
492b302aded6 Move __builtins__.trunc() to math.trunc() per Jeffrey Yasskin <jyasskin@gmail.com> parents: 44947 diff changeset	575 "\n"
45102 ce9816f53690 Neaten-up a bit. Raymond Hettinger <python@rcn.com> parents: 45079 diff changeset	576 "Truncates x to the nearest Integral toward 0. Uses the __trunc__ magic method.");
45079 492b302aded6 Move __builtins__.trunc() to math.trunc() per Jeffrey Yasskin <jyasskin@gmail.com> parents: 44947 diff changeset	577
492b302aded6 Move __builtins__.trunc() to math.trunc() per Jeffrey Yasskin <jyasskin@gmail.com> parents: 44947 diff changeset	578 static PyObject *
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	579 math_frexp(PyObject self, PyObject arg)
407 9b3d557665a9 Added frexp, ldexp, modf, fmod. Guido van Rossum <guido@python.org> parents: 320 diff changeset	580 {
9b3d557665a9 Added frexp, ldexp, modf, fmod. Guido van Rossum <guido@python.org> parents: 320 diff changeset	581 int i;
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	582 double x = PyFloat_AsDouble(arg);
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	583 if (x == -1.0 && PyErr_Occurred())
407 9b3d557665a9 Added frexp, ldexp, modf, fmod. Guido van Rossum <guido@python.org> parents: 320 diff changeset	584 return NULL;
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	585 /* deal with special cases directly, to sidestep platform
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	586 differences */
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	587 if (Py_IS_NAN(x) \|\| Py_IS_INFINITY(x) \|\| !x) {
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	588 i = 0;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	589 }
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	590 else {
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	591 PyFPE_START_PROTECT("in math_frexp", return 0);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	592 x = frexp(x, &i);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	593 PyFPE_END_PROTECT(x);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	594 }
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	595 return Py_BuildValue("(di)", x, i);
407 9b3d557665a9 Added frexp, ldexp, modf, fmod. Guido van Rossum <guido@python.org> parents: 320 diff changeset	596 }
9b3d557665a9 Added frexp, ldexp, modf, fmod. Guido van Rossum <guido@python.org> parents: 320 diff changeset	597
23832 ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	598 PyDoc_STRVAR(math_frexp_doc,
19712 b4521436e8f8 Mechanical fiddling to make this easier to work with in my editor. Tim Peters <tim.peters@gmail.com> parents: 19048 diff changeset	599 "frexp(x)\n"
b4521436e8f8 Mechanical fiddling to make this easier to work with in my editor. Tim Peters <tim.peters@gmail.com> parents: 19048 diff changeset	600 "\n"
b4521436e8f8 Mechanical fiddling to make this easier to work with in my editor. Tim Peters <tim.peters@gmail.com> parents: 19048 diff changeset	601 "Return the mantissa and exponent of x, as pair (m, e).\n"
b4521436e8f8 Mechanical fiddling to make this easier to work with in my editor. Tim Peters <tim.peters@gmail.com> parents: 19048 diff changeset	602 "m is a float and e is an int, such that x = m * 2.**e.\n"
23832 ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	603 "If x is 0, m and e are both 0. Else 0.5 <= abs(m) < 1.0.");
9593 f22f769bf3d9 Added Doc strings -- by Chris Petrilli. Guido van Rossum <guido@python.org> parents: 9588 diff changeset	604
4635 49745ddb4f69 Renamed Barry Warsaw <barry@python.org> parents: 4503 diff changeset	605 static PyObject *
13326 24717405dd89 ANSI-fication, remove Py_PROTO, etc. Fred Drake <fdrake@acm.org> parents: 13309 diff changeset	606 math_ldexp(PyObject self, PyObject args)
407 9b3d557665a9 Added frexp, ldexp, modf, fmod. Guido van Rossum <guido@python.org> parents: 320 diff changeset	607 {
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	608 double x, r;
46797 fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	609 PyObject *oexp;
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	610 long exp;
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	611 if (! PyArg_ParseTuple(args, "dO:ldexp", &x, &oexp))
407 9b3d557665a9 Added frexp, ldexp, modf, fmod. Guido van Rossum <guido@python.org> parents: 320 diff changeset	612 return NULL;
46797 fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	613
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	614 if (PyLong_Check(oexp)) {
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	615 /* on overflow, replace exponent with either LONG_MAX
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	616 or LONG_MIN, depending on the sign. */
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	617 exp = PyLong_AsLong(oexp);
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	618 if (exp == -1 && PyErr_Occurred()) {
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	619 if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	620 if (Py_SIZE(oexp) < 0) {
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	621 exp = LONG_MIN;
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	622 }
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	623 else {
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	624 exp = LONG_MAX;
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	625 }
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	626 PyErr_Clear();
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	627 }
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	628 else {
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	629 /* propagate any unexpected exception */
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	630 return NULL;
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	631 }
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	632 }
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	633 }
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	634 else if (PyInt_Check(oexp)) {
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	635 exp = PyInt_AS_LONG(oexp);
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	636 }
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	637 else {
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	638 PyErr_SetString(PyExc_TypeError,
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	639 "Expected an int or long as second argument "
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	640 "to ldexp.");
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	641 return NULL;
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	642 }
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	643
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	644 if (x == 0. \|\| !Py_IS_FINITE(x)) {
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	645 /* NaNs, zeros and infinities are returned unchanged */
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	646 r = x;
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	647 errno = 0;
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	648 } else if (exp > INT_MAX) {
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	649 /* overflow */
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	650 r = copysign(Py_HUGE_VAL, x);
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	651 errno = ERANGE;
46797 fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	652 } else if (exp < INT_MIN) {
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	653 /* underflow to +-0 */
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	654 r = copysign(0., x);
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	655 errno = 0;
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	656 } else {
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	657 errno = 0;
46797 fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	658 PyFPE_START_PROTECT("in math_ldexp", return 0);
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	659 r = ldexp(x, (int)exp);
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	660 PyFPE_END_PROTECT(r);
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	661 if (Py_IS_INFINITY(r))
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	662 errno = ERANGE;
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	663 }
fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	664
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	665 if (errno && is_error(r))
15170 09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and Tim Peters <tim.peters@gmail.com> parents: 14616 diff changeset	666 return NULL;
46797 fd0b894bc90c Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and Mark Dickinson <dickinsm@gmail.com> parents: 46509 diff changeset	667 return PyFloat_FromDouble(r);
407 9b3d557665a9 Added frexp, ldexp, modf, fmod. Guido van Rossum <guido@python.org> parents: 320 diff changeset	668 }
9b3d557665a9 Added frexp, ldexp, modf, fmod. Guido van Rossum <guido@python.org> parents: 320 diff changeset	669
23832 ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	670 PyDoc_STRVAR(math_ldexp_doc,
ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	671 "ldexp(x, i) -> x * (2**i)");
9593 f22f769bf3d9 Added Doc strings -- by Chris Petrilli. Guido van Rossum <guido@python.org> parents: 9588 diff changeset	672
4635 49745ddb4f69 Renamed Barry Warsaw <barry@python.org> parents: 4503 diff changeset	673 static PyObject *
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	674 math_modf(PyObject self, PyObject arg)
407 9b3d557665a9 Added frexp, ldexp, modf, fmod. Guido van Rossum <guido@python.org> parents: 320 diff changeset	675 {
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	676 double y, x = PyFloat_AsDouble(arg);
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	677 if (x == -1.0 && PyErr_Occurred())
407 9b3d557665a9 Added frexp, ldexp, modf, fmod. Guido van Rossum <guido@python.org> parents: 320 diff changeset	678 return NULL;
46499 80b16595e462 FreeBSD doesn't follow C99 for modf(inf); so add explicit Mark Dickinson <dickinsm@gmail.com> parents: 46490 diff changeset	679 /* some platforms don't do the right thing for NaNs and
80b16595e462 FreeBSD doesn't follow C99 for modf(inf); so add explicit Mark Dickinson <dickinsm@gmail.com> parents: 46490 diff changeset	680 infinities, so we take care of special cases directly. */
80b16595e462 FreeBSD doesn't follow C99 for modf(inf); so add explicit Mark Dickinson <dickinsm@gmail.com> parents: 46490 diff changeset	681 if (!Py_IS_FINITE(x)) {
80b16595e462 FreeBSD doesn't follow C99 for modf(inf); so add explicit Mark Dickinson <dickinsm@gmail.com> parents: 46490 diff changeset	682 if (Py_IS_INFINITY(x))
80b16595e462 FreeBSD doesn't follow C99 for modf(inf); so add explicit Mark Dickinson <dickinsm@gmail.com> parents: 46490 diff changeset	683 return Py_BuildValue("(dd)", copysign(0., x), x);
80b16595e462 FreeBSD doesn't follow C99 for modf(inf); so add explicit Mark Dickinson <dickinsm@gmail.com> parents: 46490 diff changeset	684 else if (Py_IS_NAN(x))
80b16595e462 FreeBSD doesn't follow C99 for modf(inf); so add explicit Mark Dickinson <dickinsm@gmail.com> parents: 46490 diff changeset	685 return Py_BuildValue("(dd)", x, x);
80b16595e462 FreeBSD doesn't follow C99 for modf(inf); so add explicit Mark Dickinson <dickinsm@gmail.com> parents: 46490 diff changeset	686 }
80b16595e462 FreeBSD doesn't follow C99 for modf(inf); so add explicit Mark Dickinson <dickinsm@gmail.com> parents: 46490 diff changeset	687
407 9b3d557665a9 Added frexp, ldexp, modf, fmod. Guido van Rossum <guido@python.org> parents: 320 diff changeset	688 errno = 0;
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	689 PyFPE_START_PROTECT("in math_modf", return 0);
407 9b3d557665a9 Added frexp, ldexp, modf, fmod. Guido van Rossum <guido@python.org> parents: 320 diff changeset	690 x = modf(x, &y);
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	691 PyFPE_END_PROTECT(x);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	692 return Py_BuildValue("(dd)", x, y);
407 9b3d557665a9 Added frexp, ldexp, modf, fmod. Guido van Rossum <guido@python.org> parents: 320 diff changeset	693 }
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	694
23832 ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	695 PyDoc_STRVAR(math_modf_doc,
19712 b4521436e8f8 Mechanical fiddling to make this easier to work with in my editor. Tim Peters <tim.peters@gmail.com> parents: 19048 diff changeset	696 "modf(x)\n"
b4521436e8f8 Mechanical fiddling to make this easier to work with in my editor. Tim Peters <tim.peters@gmail.com> parents: 19048 diff changeset	697 "\n"
b4521436e8f8 Mechanical fiddling to make this easier to work with in my editor. Tim Peters <tim.peters@gmail.com> parents: 19048 diff changeset	698 "Return the fractional and integer parts of x. Both results carry the sign\n"
23832 ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	699 "of x. The integer part is returned as a real.");
9593 f22f769bf3d9 Added Doc strings -- by Chris Petrilli. Guido van Rossum <guido@python.org> parents: 9588 diff changeset	700
19713 9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	701 /* A decent logarithm is easy to compute even for huge longs, but libm can't
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	702 do that by itself -- loghelper can. func is log or log10, and name is
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	703 "log" or "log10". Note that overflow isn't possible: a long can contain
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	704 no more than INT_MAX * SHIFT bits, so has value certainly less than
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	705 2(264 * 216) == 2280, and log2 of that is 280, which is
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	706 small enough to fit in an IEEE single. log and log10 are even smaller.
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	707 */
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	708
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	709 static PyObject*
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	710 loghelper(PyObject* arg, double (func)(double), char funcname)
19713 9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	711 {
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	712 /* If it is long, do it ourselves. */
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	713 if (PyLong_Check(arg)) {
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	714 double x;
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	715 int e;
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	716 x = _PyLong_AsScaledDouble(arg, &e);
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	717 if (x <= 0.0) {
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	718 PyErr_SetString(PyExc_ValueError,
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	719 "math domain error");
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	720 return NULL;
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	721 }
44947 8e435bdd4bc8 setup.py doesn't pick up changes to a header file Christian Heimes <christian@cheimes.de> parents: 44940 diff changeset	722 /* Value is ~= x * 2*(ePyLong_SHIFT), so the log ~=
8e435bdd4bc8 setup.py doesn't pick up changes to a header file Christian Heimes <christian@cheimes.de> parents: 44940 diff changeset	723 log(x) + log(2) * e * PyLong_SHIFT.
8e435bdd4bc8 setup.py doesn't pick up changes to a header file Christian Heimes <christian@cheimes.de> parents: 44940 diff changeset	724 CAUTION: e*PyLong_SHIFT may overflow using int arithmetic,
19713 9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	725 so force use of double. */
44947 8e435bdd4bc8 setup.py doesn't pick up changes to a header file Christian Heimes <christian@cheimes.de> parents: 44940 diff changeset	726 x = func(x) + (e * (double)PyLong_SHIFT) * func(2.0);
19713 9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	727 return PyFloat_FromDouble(x);
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	728 }
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	729
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	730 /* Else let libm handle it by itself. */
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	731 return math_1(arg, func, 0);
19713 9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	732 }
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	733
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	734 static PyObject *
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	735 math_log(PyObject self, PyObject args)
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	736 {
26661 b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	737 PyObject *arg;
b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	738 PyObject *base = NULL;
b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	739 PyObject num, den;
b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	740 PyObject *ans;
b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	741
26818 e094a03a80ff SF patch #659536: Use PyArg_UnpackTuple where possible. Raymond Hettinger <python@rcn.com> parents: 26661 diff changeset	742 if (!PyArg_UnpackTuple(args, "log", 1, 2, &arg, &base))
26661 b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	743 return NULL;
b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	744
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	745 num = loghelper(arg, log, "log");
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	746 if (num == NULL \|\| base == NULL)
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	747 return num;
26661 b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	748
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	749 den = loghelper(base, log, "log");
26661 b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	750 if (den == NULL) {
b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	751 Py_DECREF(num);
b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	752 return NULL;
b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	753 }
b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	754
b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	755 ans = PyNumber_Divide(num, den);
b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	756 Py_DECREF(num);
b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	757 Py_DECREF(den);
b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	758 return ans;
19713 9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	759 }
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	760
23832 ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	761 PyDoc_STRVAR(math_log_doc,
26661 b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	762 "log(x[, base]) -> the logarithm of x to the given base.\n\
b12e326b4ea2 Apply SF patch 652930: Add optional base argument to math.log(x[, base]). Raymond Hettinger <python@rcn.com> parents: 24471 diff changeset	763 If the base not specified, returns the natural logarithm (base e) of x.");
19713 9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	764
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	765 static PyObject *
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	766 math_log10(PyObject self, PyObject arg)
19713 9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	767 {
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	768 return loghelper(arg, log10, "log10");
19713 9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	769 }
9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	770
23832 ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	771 PyDoc_STRVAR(math_log10_doc,
ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	772 "log10(x) -> the base 10 logarithm of x.");
19713 9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	773
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	774 static PyObject *
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	775 math_fmod(PyObject self, PyObject args)
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	776 {
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	777 PyObject ox, oy;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	778 double r, x, y;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	779 if (! PyArg_UnpackTuple(args, "fmod", 2, 2, &ox, &oy))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	780 return NULL;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	781 x = PyFloat_AsDouble(ox);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	782 y = PyFloat_AsDouble(oy);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	783 if ((x == -1.0 \|\| y == -1.0) && PyErr_Occurred())
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	784 return NULL;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	785 /* fmod(x, +/-Inf) returns x for finite x. */
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	786 if (Py_IS_INFINITY(y) && Py_IS_FINITE(x))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	787 return PyFloat_FromDouble(x);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	788 errno = 0;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	789 PyFPE_START_PROTECT("in math_fmod", return 0);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	790 r = fmod(x, y);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	791 PyFPE_END_PROTECT(r);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	792 if (Py_IS_NAN(r)) {
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	793 if (!Py_IS_NAN(x) && !Py_IS_NAN(y))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	794 errno = EDOM;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	795 else
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	796 errno = 0;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	797 }
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	798 if (errno && is_error(r))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	799 return NULL;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	800 else
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	801 return PyFloat_FromDouble(r);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	802 }
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	803
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	804 PyDoc_STRVAR(math_fmod_doc,
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	805 "fmod(x,y)\n\nReturn fmod(x, y), according to platform C."
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	806 " x % y may differ.");
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	807
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	808 static PyObject *
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	809 math_hypot(PyObject self, PyObject args)
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	810 {
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	811 PyObject ox, oy;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	812 double r, x, y;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	813 if (! PyArg_UnpackTuple(args, "hypot", 2, 2, &ox, &oy))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	814 return NULL;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	815 x = PyFloat_AsDouble(ox);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	816 y = PyFloat_AsDouble(oy);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	817 if ((x == -1.0 \|\| y == -1.0) && PyErr_Occurred())
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	818 return NULL;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	819 /* hypot(x, +/-Inf) returns Inf, even if x is a NaN. */
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	820 if (Py_IS_INFINITY(x))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	821 return PyFloat_FromDouble(fabs(x));
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	822 if (Py_IS_INFINITY(y))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	823 return PyFloat_FromDouble(fabs(y));
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	824 errno = 0;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	825 PyFPE_START_PROTECT("in math_hypot", return 0);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	826 r = hypot(x, y);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	827 PyFPE_END_PROTECT(r);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	828 if (Py_IS_NAN(r)) {
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	829 if (!Py_IS_NAN(x) && !Py_IS_NAN(y))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	830 errno = EDOM;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	831 else
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	832 errno = 0;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	833 }
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	834 else if (Py_IS_INFINITY(r)) {
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	835 if (Py_IS_FINITE(x) && Py_IS_FINITE(y))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	836 errno = ERANGE;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	837 else
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	838 errno = 0;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	839 }
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	840 if (errno && is_error(r))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	841 return NULL;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	842 else
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	843 return PyFloat_FromDouble(r);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	844 }
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	845
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	846 PyDoc_STRVAR(math_hypot_doc,
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	847 "hypot(x,y)\n\nReturn the Euclidean distance, sqrt(xx + yy).");
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	848
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	849 /* pow can't use math_2, but needs its own wrapper: the problem is
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	850 that an infinite result can arise either as a result of overflow
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	851 (in which case OverflowError should be raised) or as a result of
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	852 e.g. 0.**-5. (for which ValueError needs to be raised.)
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	853 */
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	854
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	855 static PyObject *
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	856 math_pow(PyObject self, PyObject args)
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	857 {
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	858 PyObject ox, oy;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	859 double r, x, y;
46500 a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	860 int odd_y;
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	861
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	862 if (! PyArg_UnpackTuple(args, "pow", 2, 2, &ox, &oy))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	863 return NULL;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	864 x = PyFloat_AsDouble(ox);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	865 y = PyFloat_AsDouble(oy);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	866 if ((x == -1.0 \|\| y == -1.0) && PyErr_Occurred())
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	867 return NULL;
46490 648b4d01cccf Additional special-case handling for math.pow. Mark Dickinson <dickinsm@gmail.com> parents: 46486 diff changeset	868
46500 a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	869 /* deal directly with IEEE specials, to cope with problems on various
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	870 platforms whose semantics don't exactly match C99 */
46509 052fd8f1ca37 Silence 'r may be used uninitialized' compiler warning. Mark Dickinson <dickinsm@gmail.com> parents: 46507 diff changeset	871 r = 0.; /* silence compiler warning */
46500 a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	872 if (!Py_IS_FINITE(x) \|\| !Py_IS_FINITE(y)) {
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	873 errno = 0;
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	874 if (Py_IS_NAN(x))
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	875 r = y == 0. ? 1. : x; /* NaN*0 = 1 /
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	876 else if (Py_IS_NAN(y))
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	877 r = x == 1. ? 1. : y; /* 1*NaN = 1 /
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	878 else if (Py_IS_INFINITY(x)) {
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	879 odd_y = Py_IS_FINITE(y) && fmod(fabs(y), 2.0) == 1.0;
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	880 if (y > 0.)
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	881 r = odd_y ? x : fabs(x);
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	882 else if (y == 0.)
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	883 r = 1.;
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	884 else /* y < 0. */
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	885 r = odd_y ? copysign(0., x) : 0.;
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	886 }
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	887 else if (Py_IS_INFINITY(y)) {
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	888 if (fabs(x) == 1.0)
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	889 r = 1.;
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	890 else if (y > 0. && fabs(x) > 1.0)
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	891 r = y;
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	892 else if (y < 0. && fabs(x) < 1.0) {
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	893 r = -y; /* result is +inf */
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	894 if (x == 0.) /* 0*-inf: divide-by-zero /
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	895 errno = EDOM;
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	896 }
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	897 else
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	898 r = 0.;
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	899 }
46486 82d85a05923b Additional tests for math.pow, and extra special-case Mark Dickinson <dickinsm@gmail.com> parents: 46473 diff changeset	900 }
46500 a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	901 else {
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	902 /* let libm handle finite*finite /
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	903 errno = 0;
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	904 PyFPE_START_PROTECT("in math_pow", return 0);
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	905 r = pow(x, y);
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	906 PyFPE_END_PROTECT(r);
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	907 /* a NaN result should arise only from (-ve)**(finite
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	908 non-integer); in this case we want to raise ValueError. */
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	909 if (!Py_IS_FINITE(r)) {
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	910 if (Py_IS_NAN(r)) {
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	911 errno = EDOM;
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	912 }
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	913 /*
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	914 an infinite result here arises either from:
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	915 (A) (+/-0.)**negative (-> divide-by-zero)
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	916 (B) overflow of x**y with x and y finite
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	917 */
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	918 else if (Py_IS_INFINITY(r)) {
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	919 if (x == 0.)
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	920 errno = EDOM;
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	921 else
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	922 errno = ERANGE;
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	923 }
a20def0101de Yet more explicit special case handling to make Mark Dickinson <dickinsm@gmail.com> parents: 46499 diff changeset	924 }
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	925 }
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	926
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	927 if (errno && is_error(r))
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	928 return NULL;
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	929 else
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	930 return PyFloat_FromDouble(r);
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	931 }
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	932
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	933 PyDoc_STRVAR(math_pow_doc,
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	934 "pow(x,y)\n\nReturn x**y (x to the power of y).");
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	935
44437 968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	936 static const double degToRad = Py_MATH_PI / 180.0;
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	937 static const double radToDeg = 180.0 / Py_MATH_PI;
23427 a4d675b8b53c Added degrees() and radians() to mathmodule. Closes patch 552452 and Raymond Hettinger <python@rcn.com> parents: 19758 diff changeset	938
a4d675b8b53c Added degrees() and radians() to mathmodule. Closes patch 552452 and Raymond Hettinger <python@rcn.com> parents: 19758 diff changeset	939 static PyObject *
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	940 math_degrees(PyObject self, PyObject arg)
23427 a4d675b8b53c Added degrees() and radians() to mathmodule. Closes patch 552452 and Raymond Hettinger <python@rcn.com> parents: 19758 diff changeset	941 {
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	942 double x = PyFloat_AsDouble(arg);
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	943 if (x == -1.0 && PyErr_Occurred())
23427 a4d675b8b53c Added degrees() and radians() to mathmodule. Closes patch 552452 and Raymond Hettinger <python@rcn.com> parents: 19758 diff changeset	944 return NULL;
44437 968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	945 return PyFloat_FromDouble(x * radToDeg);
23427 a4d675b8b53c Added degrees() and radians() to mathmodule. Closes patch 552452 and Raymond Hettinger <python@rcn.com> parents: 19758 diff changeset	946 }
a4d675b8b53c Added degrees() and radians() to mathmodule. Closes patch 552452 and Raymond Hettinger <python@rcn.com> parents: 19758 diff changeset	947
23832 ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	948 PyDoc_STRVAR(math_degrees_doc,
ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	949 "degrees(x) -> converts angle x from radians to degrees");
23427 a4d675b8b53c Added degrees() and radians() to mathmodule. Closes patch 552452 and Raymond Hettinger <python@rcn.com> parents: 19758 diff changeset	950
a4d675b8b53c Added degrees() and radians() to mathmodule. Closes patch 552452 and Raymond Hettinger <python@rcn.com> parents: 19758 diff changeset	951 static PyObject *
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	952 math_radians(PyObject self, PyObject arg)
23427 a4d675b8b53c Added degrees() and radians() to mathmodule. Closes patch 552452 and Raymond Hettinger <python@rcn.com> parents: 19758 diff changeset	953 {
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	954 double x = PyFloat_AsDouble(arg);
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	955 if (x == -1.0 && PyErr_Occurred())
23427 a4d675b8b53c Added degrees() and radians() to mathmodule. Closes patch 552452 and Raymond Hettinger <python@rcn.com> parents: 19758 diff changeset	956 return NULL;
a4d675b8b53c Added degrees() and radians() to mathmodule. Closes patch 552452 and Raymond Hettinger <python@rcn.com> parents: 19758 diff changeset	957 return PyFloat_FromDouble(x * degToRad);
a4d675b8b53c Added degrees() and radians() to mathmodule. Closes patch 552452 and Raymond Hettinger <python@rcn.com> parents: 19758 diff changeset	958 }
a4d675b8b53c Added degrees() and radians() to mathmodule. Closes patch 552452 and Raymond Hettinger <python@rcn.com> parents: 19758 diff changeset	959
23832 ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	960 PyDoc_STRVAR(math_radians_doc,
ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	961 "radians(x) -> converts angle x from degrees to radians");
19713 9433dd3c197e Return reasonable results for math.log(long) and math.log10(long) (we were Tim Peters <tim.peters@gmail.com> parents: 19712 diff changeset	962
44437 968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	963 static PyObject *
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	964 math_isnan(PyObject self, PyObject arg)
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	965 {
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	966 double x = PyFloat_AsDouble(arg);
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	967 if (x == -1.0 && PyErr_Occurred())
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	968 return NULL;
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	969 return PyBool_FromLong((long)Py_IS_NAN(x));
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	970 }
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	971
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	972 PyDoc_STRVAR(math_isnan_doc,
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	973 "isnan(x) -> bool\n\
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	974 Checks if float x is not a number (NaN)");
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	975
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	976 static PyObject *
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	977 math_isinf(PyObject self, PyObject arg)
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	978 {
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	979 double x = PyFloat_AsDouble(arg);
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	980 if (x == -1.0 && PyErr_Occurred())
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	981 return NULL;
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	982 return PyBool_FromLong((long)Py_IS_INFINITY(x));
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	983 }
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	984
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	985 PyDoc_STRVAR(math_isinf_doc,
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	986 "isinf(x) -> bool\n\
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	987 Checks if float x is infinite (positive or negative)");
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	988
4635 49745ddb4f69 Renamed Barry Warsaw <barry@python.org> parents: 4503 diff changeset	989 static PyMethodDef math_methods[] = {
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	990 {"acos", math_acos, METH_O, math_acos_doc},
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	991 {"acosh", math_acosh, METH_O, math_acosh_doc},
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	992 {"asin", math_asin, METH_O, math_asin_doc},
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	993 {"asinh", math_asinh, METH_O, math_asinh_doc},
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	994 {"atan", math_atan, METH_O, math_atan_doc},
13326 24717405dd89 ANSI-fication, remove Py_PROTO, etc. Fred Drake <fdrake@acm.org> parents: 13309 diff changeset	995 {"atan2", math_atan2, METH_VARARGS, math_atan2_doc},
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	996 {"atanh", math_atanh, METH_O, math_atanh_doc},
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	997 {"ceil", math_ceil, METH_O, math_ceil_doc},
44440 6208b17d0dbe Added copysign(x, y) function to the math module Christian Heimes <christian@cheimes.de> parents: 44437 diff changeset	998 {"copysign", math_copysign, METH_VARARGS, math_copysign_doc},
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	999 {"cos", math_cos, METH_O, math_cos_doc},
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	1000 {"cosh", math_cosh, METH_O, math_cosh_doc},
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	1001 {"degrees", math_degrees, METH_O, math_degrees_doc},
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	1002 {"exp", math_exp, METH_O, math_exp_doc},
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	1003 {"fabs", math_fabs, METH_O, math_fabs_doc},
47529 6428c4f1ae09 Issue #2138: Add math.factorial(). Raymond Hettinger <python@rcn.com> parents: 47395 diff changeset	1004 {"factorial", math_factorial, METH_O, math_factorial_doc},
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	1005 {"floor", math_floor, METH_O, math_floor_doc},
13326 24717405dd89 ANSI-fication, remove Py_PROTO, etc. Fred Drake <fdrake@acm.org> parents: 13309 diff changeset	1006 {"fmod", math_fmod, METH_VARARGS, math_fmod_doc},
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	1007 {"frexp", math_frexp, METH_O, math_frexp_doc},
13326 24717405dd89 ANSI-fication, remove Py_PROTO, etc. Fred Drake <fdrake@acm.org> parents: 13309 diff changeset	1008 {"hypot", math_hypot, METH_VARARGS, math_hypot_doc},
44437 968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	1009 {"isinf", math_isinf, METH_O, math_isinf_doc},
968bda81e6c8 Added math.isinf() and math.isnan() Christian Heimes <christian@cheimes.de> parents: 44432 diff changeset	1010 {"isnan", math_isnan, METH_O, math_isnan_doc},
13326 24717405dd89 ANSI-fication, remove Py_PROTO, etc. Fred Drake <fdrake@acm.org> parents: 13309 diff changeset	1011 {"ldexp", math_ldexp, METH_VARARGS, math_ldexp_doc},
24717405dd89 ANSI-fication, remove Py_PROTO, etc. Fred Drake <fdrake@acm.org> parents: 13309 diff changeset	1012 {"log", math_log, METH_VARARGS, math_log_doc},
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	1013 {"log1p", math_log1p, METH_O, math_log1p_doc},
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	1014 {"log10", math_log10, METH_O, math_log10_doc},
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	1015 {"modf", math_modf, METH_O, math_modf_doc},
13326 24717405dd89 ANSI-fication, remove Py_PROTO, etc. Fred Drake <fdrake@acm.org> parents: 13309 diff changeset	1016 {"pow", math_pow, METH_VARARGS, math_pow_doc},
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	1017 {"radians", math_radians, METH_O, math_radians_doc},
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	1018 {"sin", math_sin, METH_O, math_sin_doc},
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	1019 {"sinh", math_sinh, METH_O, math_sinh_doc},
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	1020 {"sqrt", math_sqrt, METH_O, math_sqrt_doc},
47216 2fffdedb10f8 Issue #2819: Add math.sum, a function that sums a sequence of floats Mark Dickinson <dickinsm@gmail.com> parents: 46797 diff changeset	1021 {"sum", math_sum, METH_O, math_sum_doc},
40362 271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	1022 {"tan", math_tan, METH_O, math_tan_doc},
271133981e63 Speed up function calls into the math module by using METH_O. Neal Norwitz <nnorwitz@gmail.com> parents: 38491 diff changeset	1023 {"tanh", math_tanh, METH_O, math_tanh_doc},
45079 492b302aded6 Move __builtins__.trunc() to math.trunc() per Jeffrey Yasskin <jyasskin@gmail.com> parents: 44947 diff changeset	1024 {"trunc", math_trunc, METH_O, math_trunc_doc},
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	1025 {NULL, NULL} /* sentinel */
fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	1026 };
fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	1027
9593 f22f769bf3d9 Added Doc strings -- by Chris Petrilli. Guido van Rossum <guido@python.org> parents: 9588 diff changeset	1028
23832 ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	1029 PyDoc_STRVAR(module_doc,
19712 b4521436e8f8 Mechanical fiddling to make this easier to work with in my editor. Tim Peters <tim.peters@gmail.com> parents: 19048 diff changeset	1030 "This module is always available. It provides access to the\n"
23832 ed1ba37a46b7 Patch #568124: Add doc string macros. Martin v. Löwis <martin@v.loewis.de> parents: 23427 diff changeset	1031 "mathematical functions defined by the C standard.");
9593 f22f769bf3d9 Added Doc strings -- by Chris Petrilli. Guido van Rossum <guido@python.org> parents: 9588 diff changeset	1032
24471 f66b3a3509c7 Excise DL_EXPORT/DL_IMPORT from Modules/. Required adding a prototype Mark Hammond <mhammond@skippinet.com.au>* parents: 23832 diff changeset	1033 PyMODINIT_FUNC
13651 8a063423e0b7 Bunch of minor ANSIfications: 'void initfunc()' -> 'void initfunc(void)', Thomas Wouters <thomas@python.org> parents: 13331 diff changeset	1034 initmath(void)
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	1035 {
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	1036 PyObject *m;
19048 e282d6b2b758 Part of SF patch [#431848] mathmodule.c: doc strings & conversion, from Tim Peters <tim.peters@gmail.com> parents: 18066 diff changeset	1037
9593 f22f769bf3d9 Added Doc strings -- by Chris Petrilli. Guido van Rossum <guido@python.org> parents: 9588 diff changeset	1038 m = Py_InitModule3("math", math_methods, module_doc);
36324 1af7f719ed28 Check return result from Py_InitModule(). This API can fail. Neal Norwitz <nnorwitz@gmail.com>* parents: 34872 diff changeset	1039 if (m == NULL)
1af7f719ed28 Check return result from Py_InitModule(). This API can fail. Neal Norwitz <nnorwitz@gmail.com>* parents: 34872 diff changeset	1040 goto finally;
4752 7367fb107108 Better error checking in initmath(). Barry Warsaw <barry@python.org> parents: 4635 diff changeset	1041
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	1042 PyModule_AddObject(m, "pi", PyFloat_FromDouble(Py_MATH_PI));
5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	1043 PyModule_AddObject(m, "e", PyFloat_FromDouble(Py_MATH_E));
4752 7367fb107108 Better error checking in initmath(). Barry Warsaw <barry@python.org> parents: 4635 diff changeset	1044
46473 5bc7b20dc04a I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. Christian Heimes <christian@cheimes.de> parents: 45102 diff changeset	1045 finally:
14346 5397fdf88ec2 Do the absolute minimal amount of modifications to eradicate Barry Warsaw <barry@python.org> parents: 13912 diff changeset	1046 return;
6 fc6fcd7df4f7 Initial revision Guido van Rossum <guido@python.org> parents: diff changeset	1047 }

Mercurial > cpython-lru_cache-weakref

annotate Modules/mathmodule.c @ 47927:76325c19af84 legacy-trunk