Mercurial > cpython-lru_cache-weakref

annotate Modules/mathmodule.c @ 892:11ea669c231e legacy-trunk

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Documented new contents of lib5.tex
author Guido van Rossum <guido@python.org>
date Wed, 03 Jun 1992 17:56:44 +0000
parents 0cd197947d81
children c4cd0d9d8281
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1 /***********************************************************
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2 Copyright 1991, 1992 by Stichting Mathematisch Centrum, Amsterdam, The
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3 Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI not be used in advertising or publicity pertaining to
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13 distribution of the software without specific, written prior permission.
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14
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15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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22
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23 ******************************************************************/
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24
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25 /* Math module -- standard C math library functions, pi and e */
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26
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27 #include "allobjects.h"
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28
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29 #include <errno.h>
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30 #ifndef errno
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31 extern int errno;
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32 #endif
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33
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34 #include "modsupport.h"
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35
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36 #include <math.h>
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37
591
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38 #ifndef __STDC__
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39 extern double fmod PROTO((double, double));
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40 #endif
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41
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42 #ifdef HUGE_VAL
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43 #define CHECK(x) if (errno != 0) ; \
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44 else if (-HUGE_VAL <= (x) && (x) <= HUGE_VAL) ; \
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45 else errno = ERANGE
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46 #else
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47 #define CHECK(x) /* Don't know how to check */
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48 #endif
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49
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50 static object *
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51 math_error()
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52 {
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53 if (errno == EDOM)
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54 err_setstr(ValueError, "math domain error");
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55 else if (errno == ERANGE)
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56 err_setstr(OverflowError, "math range error");
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57 else
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58 err_errno(ValueError); /* Unexpected math error */
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59 return NULL;
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60 }
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61
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62 static object *
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63 math_1(args, func)
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64 object *args;
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65 double (*func) FPROTO((double));
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66 {
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67 double x;
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68 if (!getdoublearg(args, &x))
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69 return NULL;
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70 errno = 0;
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71 x = (*func)(x);
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72 CHECK(x);
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73 if (errno != 0)
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74 return math_error();
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75 else
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76 return newfloatobject(x);
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77 }
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78
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79 static object *
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80 math_2(args, func)
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81 object *args;
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82 double (*func) FPROTO((double, double));
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83 {
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84 double x, y;
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85 if (!get2doublearg(args, &x, &y))
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86 return NULL;
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87 errno = 0;
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88 x = (*func)(x, y);
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89 CHECK(x);
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90 if (errno != 0)
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91 return math_error();
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92 else
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93 return newfloatobject(x);
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94 }
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95
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96 #define FUNC1(stubname, func) \
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97 static object * stubname(self, args) object *self, *args; { \
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98 return math_1(args, func); \
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99 }
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100
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101 #define FUNC2(stubname, func) \
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102 static object * stubname(self, args) object *self, *args; { \
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103 return math_2(args, func); \
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104 }
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105
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106 FUNC1(math_acos, acos)
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107 FUNC1(math_asin, asin)
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108 FUNC1(math_atan, atan)
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109 FUNC2(math_atan2, atan2)
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110 FUNC1(math_ceil, ceil)
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111 FUNC1(math_cos, cos)
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112 FUNC1(math_cosh, cosh)
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113 FUNC1(math_exp, exp)
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114 FUNC1(math_fabs, fabs)
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115 FUNC1(math_floor, floor)
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116 FUNC2(math_fmod, fmod)
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117 FUNC1(math_log, log)
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118 FUNC1(math_log10, log10)
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119 #ifdef MPW_3_1 /* This hack is needed for MPW 3.1 but not for 3.2 ... */
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120 FUNC2(math_pow, power)
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121 #else
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122 FUNC2(math_pow, pow)
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123 #endif
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124 FUNC1(math_sin, sin)
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125 FUNC1(math_sinh, sinh)
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126 FUNC1(math_sqrt, sqrt)
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127 FUNC1(math_tan, tan)
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128 FUNC1(math_tanh, tanh)
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129
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130 double frexp PROTO((double, int *));
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131 double ldexp PROTO((double, int));
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132 double modf PROTO((double, double *));
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133
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134 static object *
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135 math_frexp(self, args)
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136 object *self;
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137 object *args;
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138 {
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139 object *v;
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140 double x;
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141 int i;
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142 if (!getdoublearg(args, &x))
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143 return NULL;
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144 errno = 0;
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145 x = frexp(x, &i);
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146 CHECK(x);
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147 if (errno != 0)
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148 return math_error();
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149 v = newtupleobject(2);
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150 if (v != NULL) {
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151 settupleitem(v, 0, newfloatobject(x));
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152 settupleitem(v, 1, newintobject((long)i));
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153 if (err_occurred()) {
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154 DECREF(v);
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155 v = NULL;
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156 }
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157 }
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158 return v;
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159 }
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160
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161 static object *
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162 math_ldexp(self, args)
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163 object *self;
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164 object *args;
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165 {
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166 double x, y;
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167 /* Cheat -- allow float as second argument */
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168 if (!get2doublearg(args, &x, &y))
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169 return NULL;
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170 errno = 0;
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171 x = ldexp(x, (int)y);
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172 CHECK(x);
407
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173 if (errno != 0)
498
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174 return math_error();
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175 else
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176 return newfloatobject(x);
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177 }
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178
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179 static object *
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180 math_modf(self, args)
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181 object *self;
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182 object *args;
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183 {
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184 object *v;
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185 double x, y;
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186 if (!getdoublearg(args, &x))
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187 return NULL;
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188 errno = 0;
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189 x = modf(x, &y);
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190 CHECK(x);
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191 if (errno != 0)
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192 return math_error();
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193 v = newtupleobject(2);
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194 if (v != NULL) {
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195 settupleitem(v, 0, newfloatobject(x));
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196 settupleitem(v, 1, newfloatobject(y));
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197 if (err_occurred()) {
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198 DECREF(v);
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199 v = NULL;
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200 }
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201 }
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202 return v;
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203 }
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204
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205 static struct methodlist math_methods[] = {
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206 {"acos", math_acos},
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207 {"asin", math_asin},
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208 {"atan", math_atan},
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209 {"atan2", math_atan2},
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210 {"ceil", math_ceil},
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211 {"cos", math_cos},
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212 {"cosh", math_cosh},
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213 {"exp", math_exp},
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214 {"fabs", math_fabs},
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215 {"floor", math_floor},
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216 {"fmod", math_fmod},
407
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217 {"frexp", math_frexp},
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218 {"ldexp", math_ldexp},
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219 {"log", math_log},
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220 {"log10", math_log10},
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221 {"modf", math_modf},
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222 {"pow", math_pow},
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223 {"sin", math_sin},
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224 {"sinh", math_sinh},
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225 {"sqrt", math_sqrt},
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226 {"tan", math_tan},
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227 {"tanh", math_tanh},
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228 {NULL, NULL} /* sentinel */
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229 };
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230
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231 void
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232 initmath()
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233 {
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234 object *m, *d, *v;
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235
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236 m = initmodule("math", math_methods);
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237 d = getmoduledict(m);
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238 dictinsert(d, "pi", v = newfloatobject(atan(1.0) * 4.0));
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239 DECREF(v);
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240 dictinsert(d, "e", v = newfloatobject(exp(1.0)));
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241 DECREF(v);
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242 }