Mercurial > cpython-lru_cache-weakref

annotate Modules/mathmodule.c @ 19283:b865cd5c1925 legacy-trunk

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Added comments before recently added/assigned slots in the type object, so the backward compatibility issues will be easier to understand. I only added comments indicating additions and assignments back to Python 2.0.
author Fred Drake <fdrake@acm.org>
date Wed, 15 Aug 2001 18:32:33 +0000
parents e282d6b2b758
children b4521436e8f8
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1 /* Math module -- standard C math library functions, pi and e */
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2
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3 #include "Python.h"
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4
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5 #ifndef _MSC_VER
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6 #ifndef __STDC__
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7 extern double fmod (double, double);
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8 extern double frexp (double, int *);
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9 extern double ldexp (double, int);
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10 extern double modf (double, double *);
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11 #endif /* __STDC__ */
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12 #endif /* _MSC_VER */
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13
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14
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2919b448e385 * Microscopic corrections to make things compile on the Cray APP.
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15 #ifdef i860
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16 /* Cray APP has bogus definition of HUGE_VAL in <math.h> */
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17 #undef HUGE_VAL
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18 #endif
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19
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20 /* RED_FLAG 12-Oct-2000 Tim
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21 * What CHECK does if errno == 0 and x is a NaN is a platform-dependent crap
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22 * shoot. Most (but not all!) platforms will end up setting errno to ERANGE
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23 * then, but EDOM is probably better.
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24 */
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25 #ifdef HUGE_VAL
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26 #define CHECK(x) if (errno != 0) ; \
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27 else if (-HUGE_VAL <= (x) && (x) <= HUGE_VAL) ; \
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28 else errno = ERANGE
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29 #else
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30 #define CHECK(x) /* Don't know how to check */
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31 #endif
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32
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33 /* Call is_error when errno != 0, and where x is the result libm
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34 * returned. is_error will usually set up an exception and return
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35 * true (1), but may return false (0) without setting up an exception.
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36 */
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37 static int
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38 is_error(double x)
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39 {
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40 int result = 1; /* presumption of guilt */
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41 assert(errno); /* non-zero errno is a precondition for calling */
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42 if (errno == EDOM)
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43 PyErr_SetString(PyExc_ValueError, "math domain error");
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44 else if (errno == ERANGE) {
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45 /* ANSI C generally requires libm functions to set ERANGE
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46 * on overflow, but also generally *allows* them to set
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47 * ERANGE on underflow too. There's no consistency about
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48 * the latter across platforms. Here we suppress the
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49 * underflow errors (libm functions should return a zero
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50 * on underflow, and +- HUGE_VAL on overflow, so testing
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51 * the result for zero suffices to distinguish the cases).
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52 */
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53 if (x)
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54 PyErr_SetString(PyExc_OverflowError,
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55 "math range error");
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56 else
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57 result = 0;
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58 }
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59 else
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60 /* Unexpected math error */
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61 PyErr_SetFromErrno(PyExc_ValueError);
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62 return result;
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63 }
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64
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65 static PyObject *
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66 math_1(PyObject *args, double (*func) (double), char *argsfmt)
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67 {
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68 double x;
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69 if (! PyArg_ParseTuple(args, argsfmt, &x))
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70 return NULL;
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71 errno = 0;
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72 PyFPE_START_PROTECT("in math_1", return 0)
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73 x = (*func)(x);
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74 PyFPE_END_PROTECT(x)
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75 CHECK(x);
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76 if (errno && is_error(x))
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77 return NULL;
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78 else
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79 return PyFloat_FromDouble(x);
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80 }
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81
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82 static PyObject *
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83 math_2(PyObject *args, double (*func) (double, double), char *argsfmt)
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84 {
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85 double x, y;
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86 if (! PyArg_ParseTuple(args, argsfmt, &x, &y))
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87 return NULL;
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88 errno = 0;
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89 PyFPE_START_PROTECT("in math_2", return 0)
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90 x = (*func)(x, y);
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91 PyFPE_END_PROTECT(x)
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92 CHECK(x);
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93 if (errno && is_error(x))
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94 return NULL;
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95 else
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96 return PyFloat_FromDouble(x);
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97 }
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98
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99 #define FUNC1(funcname, func, docstring) \
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100 static PyObject * math_##funcname(PyObject *self, PyObject *args) { \
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101 return math_1(args, func, "d:" #funcname); \
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102 }\
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103 static char math_##funcname##_doc [] = docstring;
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104
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105 #define FUNC2(funcname, func, docstring) \
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106 static PyObject * math_##funcname(PyObject *self, PyObject *args) { \
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107 return math_2(args, func, "dd:" #funcname); \
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108 }\
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109 static char math_##funcname##_doc [] = docstring;
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110
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111 FUNC1(acos, acos,
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112 "acos(x)\n\nReturn the arc cosine (measured in radians) of x.")
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113 FUNC1(asin, asin,
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114 "asin(x)\n\nReturn the arc sine (measured in radians) of x.")
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115 FUNC1(atan, atan,
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116 "atan(x)\n\nReturn the arc tangent (measured in radians) of x.")
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117 FUNC2(atan2, atan2,
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118 "atan2(y, x)\n\nReturn the arc tangent (measured in radians) of y/x.\n"
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119 "Unlike atan(y/x), the signs of both x and y are considered.")
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120 FUNC1(ceil, ceil,
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121 "ceil(x)\n\nReturn the ceiling of x as a float.\n"
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122 "This is the smallest integral value >= x.")
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123 FUNC1(cos, cos,
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124 "cos(x)\n\nReturn the cosine of x (measured in radians).")
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125 FUNC1(cosh, cosh,
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126 "cosh(x)\n\nReturn the hyperbolic cosine of x.")
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127 FUNC1(exp, exp,
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128 "exp(x)\n\nReturn e raised to the power of x.")
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129 FUNC1(fabs, fabs,
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130 "fabs(x)\n\nReturn the absolute value of the float x.")
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131 FUNC1(floor, floor,
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132 "floor(x)\n\nReturn the floor of x as a float.\n"
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133 "This is the largest integral value <= x.")
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134 FUNC2(fmod, fmod,
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135 "fmod(x,y)\n\nReturn fmod(x, y), according to platform C."
284508c653c7 Fixed legit gripe from c.l.py that math.fmod docs aren't confusing enough.
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parents: 14375
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136 " x % y may differ.")
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137 FUNC2(hypot, hypot,
9593
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diff changeset
138 "hypot(x,y)\n\nReturn the Euclidean distance, sqrt(x*x + y*y).")
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139 FUNC1(log, log,
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parents: 9588
diff changeset
140 "log(x)\n\nReturn the natural logarithm of x.")
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141 FUNC1(log10, log10,
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parents: 9588
diff changeset
142 "log10(x)\n\nReturn the base-10 logarithm of x.")
320
26426c42a162 Add some err_errno calls that were missing
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parents: 289
diff changeset
143 #ifdef MPW_3_1 /* This hack is needed for MPW 3.1 but not for 3.2 ... */
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144 FUNC2(pow, power,
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145 "pow(x,y)\n\nReturn x**y (x to the power of y).")
289
c4c278c56e90 Apparently MPW has power() instead of pow().
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parents: 168
diff changeset
146 #else
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147 FUNC2(pow, pow,
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148 "pow(x,y)\n\nReturn x**y (x to the power of y).")
289
c4c278c56e90 Apparently MPW has power() instead of pow().
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diff changeset
149 #endif
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150 FUNC1(sin, sin,
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151 "sin(x)\n\nReturn the sine of x (measured in radians).")
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152 FUNC1(sinh, sinh,
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diff changeset
153 "sinh(x)\n\nReturn the hyperbolic sine of x.")
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154 FUNC1(sqrt, sqrt,
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155 "sqrt(x)\n\nReturn the square root of x.")
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156 FUNC1(tan, tan,
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157 "tan(x)\n\nReturn the tangent of x (measured in radians).")
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158 FUNC1(tanh, tanh,
9593
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parents: 9588
diff changeset
159 "tanh(x)\n\nReturn the hyperbolic tangent of x.")
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160
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161
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parents: 4503
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162 static PyObject *
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163 math_frexp(PyObject *self, PyObject *args)
407
9b3d557665a9 Added frexp, ldexp, modf, fmod.
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parents: 320
diff changeset
164 {
9b3d557665a9 Added frexp, ldexp, modf, fmod.
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165 double x;
9b3d557665a9 Added frexp, ldexp, modf, fmod.
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166 int i;
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167 if (! PyArg_ParseTuple(args, "d:frexp", &x))
407
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168 return NULL;
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169 errno = 0;
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170 x = frexp(x, &i);
498
56bb1067a880 Improve error handling.
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171 CHECK(x);
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parents: 14616
diff changeset
172 if (errno && is_error(x))
09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and
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173 return NULL;
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parents: 14616
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174 else
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175 return Py_BuildValue("(di)", x, i);
407
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parents: 320
diff changeset
176 }
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177
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178 static char math_frexp_doc [] =
f22f769bf3d9 Added Doc strings -- by Chris Petrilli.
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diff changeset
179 "frexp(x)\n\
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180 \n\
13331
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parents: 13326
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181 Return the mantissa and exponent of x, as pair (m, e).\n\
13309
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parents: 13256
diff changeset
182 m is a float and e is an int, such that x = m * 2.**e.\n\
c7ef1585983c Repair docs for math.frexp (they were wrong).
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parents: 13256
diff changeset
183 If x is 0, m and e are both 0. Else 0.5 <= abs(m) < 1.0.";
9593
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184
f22f769bf3d9 Added Doc strings -- by Chris Petrilli.
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185
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186 static PyObject *
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187 math_ldexp(PyObject *self, PyObject *args)
407
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diff changeset
188 {
12618
cc4350b1b91f Trent Mick:
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189 double x;
cc4350b1b91f Trent Mick:
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190 int exp;
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191 if (! PyArg_ParseTuple(args, "di:ldexp", &x, &exp))
407
9b3d557665a9 Added frexp, ldexp, modf, fmod.
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diff changeset
192 return NULL;
9b3d557665a9 Added frexp, ldexp, modf, fmod.
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193 errno = 0;
5120
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Guido van Rossum <guido@python.org>
parents: 4780
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194 PyFPE_START_PROTECT("ldexp", return 0)
12618
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195 x = ldexp(x, exp);
5197
74c12704a0bd New form of PyFPE_END_PROTECT macro.
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196 PyFPE_END_PROTECT(x)
498
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197 CHECK(x);
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198 if (errno && is_error(x))
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199 return NULL;
407
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diff changeset
200 else
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201 return PyFloat_FromDouble(x);
407
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diff changeset
202 }
9b3d557665a9 Added frexp, ldexp, modf, fmod.
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parents: 320
diff changeset
203
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204 static char math_ldexp_doc [] =
9593
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diff changeset
205 "ldexp_doc(x, i)\n\
f22f769bf3d9 Added Doc strings -- by Chris Petrilli.
Guido van Rossum <guido@python.org>
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206 \n\
f22f769bf3d9 Added Doc strings -- by Chris Petrilli.
Guido van Rossum <guido@python.org>
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diff changeset
207 Return x * (2**i).";
f22f769bf3d9 Added Doc strings -- by Chris Petrilli.
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208
f22f769bf3d9 Added Doc strings -- by Chris Petrilli.
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209
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210 static PyObject *
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211 math_modf(PyObject *self, PyObject *args)
407
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parents: 320
diff changeset
212 {
9b3d557665a9 Added frexp, ldexp, modf, fmod.
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diff changeset
213 double x, y;
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214 if (! PyArg_ParseTuple(args, "d:modf", &x))
407
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parents: 320
diff changeset
215 return NULL;
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parents: 320
diff changeset
216 errno = 0;
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diff changeset
217 #ifdef MPW /* MPW C modf expects pointer to extended as second argument */
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diff changeset
218 {
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diff changeset
219 extended e;
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diff changeset
220 x = modf(x, &e);
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diff changeset
221 y = e;
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diff changeset
222 }
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diff changeset
223 #else
407
9b3d557665a9 Added frexp, ldexp, modf, fmod.
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diff changeset
224 x = modf(x, &y);
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diff changeset
225 #endif
498
56bb1067a880 Improve error handling.
Guido van Rossum <guido@python.org>
parents: 438
diff changeset
226 CHECK(x);
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diff changeset
227 if (errno && is_error(x))
09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and
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parents: 14616
diff changeset
228 return NULL;
09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and
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parents: 14616
diff changeset
229 else
09c7ac188ce2 Stop raising OverflowError on underflows reported by libm (errno==ERANGE and
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diff changeset
230 return Py_BuildValue("(dd)", x, y);
407
9b3d557665a9 Added frexp, ldexp, modf, fmod.
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diff changeset
231 }
6
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diff changeset
232
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233 static char math_modf_doc [] =
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Guido van Rossum <guido@python.org>
parents: 9588
diff changeset
234 "modf(x)\n\
f22f769bf3d9 Added Doc strings -- by Chris Petrilli.
Guido van Rossum <guido@python.org>
parents: 9588
diff changeset
235 \n\
f22f769bf3d9 Added Doc strings -- by Chris Petrilli.
Guido van Rossum <guido@python.org>
parents: 9588
diff changeset
236 Return the fractional and integer parts of x. Both results carry the sign\n\
f22f769bf3d9 Added Doc strings -- by Chris Petrilli.
Guido van Rossum <guido@python.org>
parents: 9588
diff changeset
237 of x. The integer part is returned as a real.";
f22f769bf3d9 Added Doc strings -- by Chris Petrilli.
Guido van Rossum <guido@python.org>
parents: 9588
diff changeset
238
f22f769bf3d9 Added Doc strings -- by Chris Petrilli.
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parents: 9588
diff changeset
239
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parents: 4503
diff changeset
240 static PyMethodDef math_methods[] = {
13326
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diff changeset
241 {"acos", math_acos, METH_VARARGS, math_acos_doc},
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diff changeset
242 {"asin", math_asin, METH_VARARGS, math_asin_doc},
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diff changeset
243 {"atan", math_atan, METH_VARARGS, math_atan_doc},
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parents: 13309
diff changeset
244 {"atan2", math_atan2, METH_VARARGS, math_atan2_doc},
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parents: 13309
diff changeset
245 {"ceil", math_ceil, METH_VARARGS, math_ceil_doc},
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parents: 13309
diff changeset
246 {"cos", math_cos, METH_VARARGS, math_cos_doc},
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parents: 13309
diff changeset
247 {"cosh", math_cosh, METH_VARARGS, math_cosh_doc},
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parents: 13309
diff changeset
248 {"exp", math_exp, METH_VARARGS, math_exp_doc},
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diff changeset
249 {"fabs", math_fabs, METH_VARARGS, math_fabs_doc},
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parents: 13309
diff changeset
250 {"floor", math_floor, METH_VARARGS, math_floor_doc},
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parents: 13309
diff changeset
251 {"fmod", math_fmod, METH_VARARGS, math_fmod_doc},
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parents: 13309
diff changeset
252 {"frexp", math_frexp, METH_VARARGS, math_frexp_doc},
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parents: 13309
diff changeset
253 {"hypot", math_hypot, METH_VARARGS, math_hypot_doc},
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parents: 13309
diff changeset
254 {"ldexp", math_ldexp, METH_VARARGS, math_ldexp_doc},
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parents: 13309
diff changeset
255 {"log", math_log, METH_VARARGS, math_log_doc},
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Fred Drake <fdrake@acm.org>
parents: 13309
diff changeset
256 {"log10", math_log10, METH_VARARGS, math_log10_doc},
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Fred Drake <fdrake@acm.org>
parents: 13309
diff changeset
257 {"modf", math_modf, METH_VARARGS, math_modf_doc},
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parents: 13309
diff changeset
258 {"pow", math_pow, METH_VARARGS, math_pow_doc},
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parents: 13309
diff changeset
259 {"sin", math_sin, METH_VARARGS, math_sin_doc},
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parents: 13309
diff changeset
260 {"sinh", math_sinh, METH_VARARGS, math_sinh_doc},
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parents: 13309
diff changeset
261 {"sqrt", math_sqrt, METH_VARARGS, math_sqrt_doc},
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parents: 13309
diff changeset
262 {"tan", math_tan, METH_VARARGS, math_tan_doc},
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parents: 13309
diff changeset
263 {"tanh", math_tanh, METH_VARARGS, math_tanh_doc},
6
fc6fcd7df4f7 Initial revision
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parents:
diff changeset
264 {NULL, NULL} /* sentinel */
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
265 };
fc6fcd7df4f7 Initial revision
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parents:
diff changeset
266
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diff changeset
267
f22f769bf3d9 Added Doc strings -- by Chris Petrilli.
Guido van Rossum <guido@python.org>
parents: 9588
diff changeset
268 static char module_doc [] =
f22f769bf3d9 Added Doc strings -- by Chris Petrilli.
Guido van Rossum <guido@python.org>
parents: 9588
diff changeset
269 "This module is always available. It provides access to the\n\
f22f769bf3d9 Added Doc strings -- by Chris Petrilli.
Guido van Rossum <guido@python.org>
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270 mathematical functions defined by the C standard.";
f22f769bf3d9 Added Doc strings -- by Chris Petrilli.
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271
9588
38023a425e48 Add DL_EXPORT() to all modules that could possibly be used
Guido van Rossum <guido@python.org>
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272 DL_EXPORT(void)
13651
8a063423e0b7 Bunch of minor ANSIfications: 'void initfunc()' -> 'void initfunc(void)',
Thomas Wouters <thomas@python.org>
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273 initmath(void)
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
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274 {
4635
49745ddb4f69 Renamed
Barry Warsaw <barry@python.org>
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275 PyObject *m, *d, *v;
19048
e282d6b2b758 Part of SF patch [#431848] mathmodule.c: doc strings & conversion, from
Tim Peters <tim.peters@gmail.com>
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276
9593
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Guido van Rossum <guido@python.org>
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277 m = Py_InitModule3("math", math_methods, module_doc);
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Barry Warsaw <barry@python.org>
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278 d = PyModule_GetDict(m);
4752
7367fb107108 Better error checking in initmath().
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279
7367fb107108 Better error checking in initmath().
Barry Warsaw <barry@python.org>
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280 if (!(v = PyFloat_FromDouble(atan(1.0) * 4.0)))
7367fb107108 Better error checking in initmath().
Barry Warsaw <barry@python.org>
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281 goto finally;
7367fb107108 Better error checking in initmath().
Barry Warsaw <barry@python.org>
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282 if (PyDict_SetItemString(d, "pi", v) < 0)
7367fb107108 Better error checking in initmath().
Barry Warsaw <barry@python.org>
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283 goto finally;
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Barry Warsaw <barry@python.org>
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284 Py_DECREF(v);
4752
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Barry Warsaw <barry@python.org>
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285
7367fb107108 Better error checking in initmath().
Barry Warsaw <barry@python.org>
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286 if (!(v = PyFloat_FromDouble(exp(1.0))))
7367fb107108 Better error checking in initmath().
Barry Warsaw <barry@python.org>
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287 goto finally;
4765
f8b36c0ec114 Correct 1-char typo / syntax error.
Guido van Rossum <guido@python.org>
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288 if (PyDict_SetItemString(d, "e", v) < 0)
4752
7367fb107108 Better error checking in initmath().
Barry Warsaw <barry@python.org>
parents: 4635
diff changeset
289 goto finally;
4635
49745ddb4f69 Renamed
Barry Warsaw <barry@python.org>
parents: 4503
diff changeset
290 Py_DECREF(v);
4752
7367fb107108 Better error checking in initmath().
Barry Warsaw <barry@python.org>
parents: 4635
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291
7367fb107108 Better error checking in initmath().
Barry Warsaw <barry@python.org>
parents: 4635
diff changeset
292 finally:
14346
5397fdf88ec2 Do the absolute minimal amount of modifications to eradicate
Barry Warsaw <barry@python.org>
parents: 13912
diff changeset
293 return;
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
294 }