diff options
author | shyouhei <shyouhei@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2008-07-07 07:36:34 +0000 |
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committer | shyouhei <shyouhei@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2008-07-07 07:36:34 +0000 |
commit | 441546edcfbb1b346c87b69c5f578d1a0e522e06 (patch) | |
tree | 04f606a008baebc445f38944ad37e87468da29ea /ruby_1_8_6/math.c | |
parent | fa93611c0f9a6db146341c792bfe3b7322ec00e2 (diff) |
add tag v1_8_6_269
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_8_6_269@17937 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'ruby_1_8_6/math.c')
-rw-r--r-- | ruby_1_8_6/math.c | 529 |
1 files changed, 529 insertions, 0 deletions
diff --git a/ruby_1_8_6/math.c b/ruby_1_8_6/math.c new file mode 100644 index 0000000000..cf78fc4f2a --- /dev/null +++ b/ruby_1_8_6/math.c @@ -0,0 +1,529 @@ +/********************************************************************** + + math.c - + + $Author$ + $Date$ + created at: Tue Jan 25 14:12:56 JST 1994 + + Copyright (C) 1993-2003 Yukihiro Matsumoto + +**********************************************************************/ + +#include "ruby.h" +#include <math.h> +#include <errno.h> + +VALUE rb_mMath; + +#define Need_Float(x) (x) = rb_Float(x) +#define Need_Float2(x,y) do {\ + Need_Float(x);\ + Need_Float(y);\ +} while (0) + +static void +domain_check(x, msg) + double x; + char *msg; +{ + while(1) { + if (errno) { + rb_sys_fail(msg); + } + if (isnan(x)) { +#if defined(EDOM) + errno = EDOM; +#elif defined(ERANGE) + errno = ERANGE; +#endif + continue; + } + break; + } +} + + +/* + * call-seq: + * Math.atan2(y, x) => float + * + * Computes the arc tangent given <i>y</i> and <i>x</i>. Returns + * -PI..PI. + * + */ + +static VALUE +math_atan2(obj, y, x) + VALUE obj, x, y; +{ + Need_Float2(y, x); + return rb_float_new(atan2(RFLOAT(y)->value, RFLOAT(x)->value)); +} + + +/* + * call-seq: + * Math.cos(x) => float + * + * Computes the cosine of <i>x</i> (expressed in radians). Returns + * -1..1. + */ + +static VALUE +math_cos(obj, x) + VALUE obj, x; +{ + Need_Float(x); + return rb_float_new(cos(RFLOAT(x)->value)); +} + +/* + * call-seq: + * Math.sin(x) => float + * + * Computes the sine of <i>x</i> (expressed in radians). Returns + * -1..1. + */ + +static VALUE +math_sin(obj, x) + VALUE obj, x; +{ + Need_Float(x); + + return rb_float_new(sin(RFLOAT(x)->value)); +} + + +/* + * call-seq: + * Math.tan(x) => float + * + * Returns the tangent of <i>x</i> (expressed in radians). + */ + +static VALUE +math_tan(obj, x) + VALUE obj, x; +{ + Need_Float(x); + + return rb_float_new(tan(RFLOAT(x)->value)); +} + +/* + * call-seq: + * Math.acos(x) => float + * + * Computes the arc cosine of <i>x</i>. Returns 0..PI. + */ + +static VALUE +math_acos(obj, x) + VALUE obj, x; +{ + double d; + + Need_Float(x); + errno = 0; + d = acos(RFLOAT(x)->value); + domain_check(d, "acos"); + return rb_float_new(d); +} + +/* + * call-seq: + * Math.asin(x) => float + * + * Computes the arc sine of <i>x</i>. Returns 0..PI. + */ + +static VALUE +math_asin(obj, x) + VALUE obj, x; +{ + double d; + + Need_Float(x); + errno = 0; + d = asin(RFLOAT(x)->value); + domain_check(d, "asin"); + return rb_float_new(d); +} + +/* + * call-seq: + * Math.atan(x) => float + * + * Computes the arc tangent of <i>x</i>. Returns -{PI/2} .. {PI/2}. + */ + +static VALUE +math_atan(obj, x) + VALUE obj, x; +{ + Need_Float(x); + return rb_float_new(atan(RFLOAT(x)->value)); +} + +#ifndef HAVE_COSH +double +cosh(x) + double x; +{ + return (exp(x) + exp(-x)) / 2; +} +#endif + +/* + * call-seq: + * Math.cosh(x) => float + * + * Computes the hyperbolic cosine of <i>x</i> (expressed in radians). + */ + +static VALUE +math_cosh(obj, x) + VALUE obj, x; +{ + Need_Float(x); + + return rb_float_new(cosh(RFLOAT(x)->value)); +} + +#ifndef HAVE_SINH +double +sinh(x) + double x; +{ + return (exp(x) - exp(-x)) / 2; +} +#endif + +/* + * call-seq: + * Math.sinh(x) => float + * + * Computes the hyperbolic sine of <i>x</i> (expressed in + * radians). + */ + +static VALUE +math_sinh(obj, x) + VALUE obj, x; +{ + Need_Float(x); + return rb_float_new(sinh(RFLOAT(x)->value)); +} + +#ifndef HAVE_TANH +double +tanh(x) + double x; +{ + return sinh(x) / cosh(x); +} +#endif + +/* + * call-seq: + * Math.tanh() => float + * + * Computes the hyperbolic tangent of <i>x</i> (expressed in + * radians). + */ + +static VALUE +math_tanh(obj, x) + VALUE obj, x; +{ + Need_Float(x); + return rb_float_new(tanh(RFLOAT(x)->value)); +} + +/* + * call-seq: + * Math.acosh(x) => float + * + * Computes the inverse hyperbolic cosine of <i>x</i>. + */ + +static VALUE +math_acosh(obj, x) + VALUE obj, x; +{ + double d; + + Need_Float(x); + errno = 0; + d = acosh(RFLOAT(x)->value); + domain_check(d, "acosh"); + return rb_float_new(d); +} + +/* + * call-seq: + * Math.asinh(x) => float + * + * Computes the inverse hyperbolic sine of <i>x</i>. + */ + +static VALUE +math_asinh(obj, x) + VALUE obj, x; +{ + Need_Float(x); + return rb_float_new(asinh(RFLOAT(x)->value)); +} + +/* + * call-seq: + * Math.atanh(x) => float + * + * Computes the inverse hyperbolic tangent of <i>x</i>. + */ + +static VALUE +math_atanh(obj, x) + VALUE obj, x; +{ + double d; + + Need_Float(x); + errno = 0; + d = atanh(RFLOAT(x)->value); + domain_check(d, "atanh"); + return rb_float_new(d); +} + +/* + * call-seq: + * Math.exp(x) => float + * + * Returns e**x. + */ + +static VALUE +math_exp(obj, x) + VALUE obj, x; +{ + Need_Float(x); + return rb_float_new(exp(RFLOAT(x)->value)); +} + +#if defined __CYGWIN__ +# include <cygwin/version.h> +# if CYGWIN_VERSION_DLL_MAJOR < 1005 +# define nan(x) nan() +# endif +# define log(x) ((x) < 0.0 ? nan("") : log(x)) +# define log10(x) ((x) < 0.0 ? nan("") : log10(x)) +#endif + +/* + * call-seq: + * Math.log(numeric) => float + * + * Returns the natural logarithm of <i>numeric</i>. + */ + +static VALUE +math_log(obj, x) + VALUE obj, x; +{ + double d; + + Need_Float(x); + errno = 0; + d = log(RFLOAT(x)->value); + domain_check(d, "log"); + return rb_float_new(d); +} + +/* + * call-seq: + * Math.log10(numeric) => float + * + * Returns the base 10 logarithm of <i>numeric</i>. + */ + +static VALUE +math_log10(obj, x) + VALUE obj, x; +{ + double d; + + Need_Float(x); + errno = 0; + d = log10(RFLOAT(x)->value); + domain_check(d, "log10"); + return rb_float_new(d); +} + +/* + * call-seq: + * Math.sqrt(numeric) => float + * + * Returns the non-negative square root of <i>numeric</i>. + */ + +static VALUE +math_sqrt(obj, x) + VALUE obj, x; +{ + double d; + + Need_Float(x); + errno = 0; + d = sqrt(RFLOAT(x)->value); + domain_check(d, "sqrt"); + return rb_float_new(d); +} + +/* + * call-seq: + * Math.frexp(numeric) => [ fraction, exponent ] + * + * Returns a two-element array containing the normalized fraction (a + * <code>Float</code>) and exponent (a <code>Fixnum</code>) of + * <i>numeric</i>. + * + * fraction, exponent = Math.frexp(1234) #=> [0.6025390625, 11] + * fraction * 2**exponent #=> 1234.0 + */ + +static VALUE +math_frexp(obj, x) + VALUE obj, x; +{ + double d; + int exp; + + Need_Float(x); + + d = frexp(RFLOAT(x)->value, &exp); + return rb_assoc_new(rb_float_new(d), INT2NUM(exp)); +} + +/* + * call-seq: + * Math.ldexp(flt, int) -> float + * + * Returns the value of <i>flt</i>*(2**<i>int</i>). + * + * fraction, exponent = Math.frexp(1234) + * Math.ldexp(fraction, exponent) #=> 1234.0 + */ + +static VALUE +math_ldexp(obj, x, n) + VALUE obj, x, n; +{ + Need_Float(x); + return rb_float_new(ldexp(RFLOAT(x)->value, NUM2INT(n))); +} + +/* + * call-seq: + * Math.hypot(x, y) => float + * + * Returns sqrt(x**2 + y**2), the hypotenuse of a right-angled triangle + * with sides <i>x</i> and <i>y</i>. + * + * Math.hypot(3, 4) #=> 5.0 + */ + +static VALUE +math_hypot(obj, x, y) + VALUE obj, x, y; +{ + Need_Float2(x, y); + return rb_float_new(hypot(RFLOAT(x)->value, RFLOAT(y)->value)); +} + +/* + * call-seq: + * Math.erf(x) => float + * + * Calculates the error function of x. + */ + +static VALUE +math_erf(obj, x) + VALUE obj, x; +{ + Need_Float(x); + return rb_float_new(erf(RFLOAT(x)->value)); +} + +/* + * call-seq: + * Math.erfc(x) => float + * + * Calculates the complementary error function of x. + */ + +static VALUE +math_erfc(obj, x) + VALUE obj, x; +{ + Need_Float(x); + return rb_float_new(erfc(RFLOAT(x)->value)); +} + +/* + * The <code>Math</code> module contains module functions for basic + * trigonometric and transcendental functions. See class + * <code>Float</code> for a list of constants that + * define Ruby's floating point accuracy. + */ + + +void +Init_Math() +{ + rb_mMath = rb_define_module("Math"); + +#ifdef M_PI + rb_define_const(rb_mMath, "PI", rb_float_new(M_PI)); +#else + rb_define_const(rb_mMath, "PI", rb_float_new(atan(1.0)*4.0)); +#endif + +#ifdef M_E + rb_define_const(rb_mMath, "E", rb_float_new(M_E)); +#else + rb_define_const(rb_mMath, "E", rb_float_new(exp(1.0))); +#endif + + rb_define_module_function(rb_mMath, "atan2", math_atan2, 2); + rb_define_module_function(rb_mMath, "cos", math_cos, 1); + rb_define_module_function(rb_mMath, "sin", math_sin, 1); + rb_define_module_function(rb_mMath, "tan", math_tan, 1); + + rb_define_module_function(rb_mMath, "acos", math_acos, 1); + rb_define_module_function(rb_mMath, "asin", math_asin, 1); + rb_define_module_function(rb_mMath, "atan", math_atan, 1); + + rb_define_module_function(rb_mMath, "cosh", math_cosh, 1); + rb_define_module_function(rb_mMath, "sinh", math_sinh, 1); + rb_define_module_function(rb_mMath, "tanh", math_tanh, 1); + + rb_define_module_function(rb_mMath, "acosh", math_acosh, 1); + rb_define_module_function(rb_mMath, "asinh", math_asinh, 1); + rb_define_module_function(rb_mMath, "atanh", math_atanh, 1); + + rb_define_module_function(rb_mMath, "exp", math_exp, 1); + rb_define_module_function(rb_mMath, "log", math_log, 1); + rb_define_module_function(rb_mMath, "log10", math_log10, 1); + rb_define_module_function(rb_mMath, "sqrt", math_sqrt, 1); + + rb_define_module_function(rb_mMath, "frexp", math_frexp, 1); + rb_define_module_function(rb_mMath, "ldexp", math_ldexp, 2); + + rb_define_module_function(rb_mMath, "hypot", math_hypot, 2); + + rb_define_module_function(rb_mMath, "erf", math_erf, 1); + rb_define_module_function(rb_mMath, "erfc", math_erfc, 1); +} |