зеркало из https://github.com/github/ruby.git
146 строки
2.8 KiB
C
146 строки
2.8 KiB
C
/**********************************************************************
|
|
|
|
math.c -
|
|
|
|
$Author$
|
|
$Date$
|
|
created at: Tue Jan 25 14:12:56 JST 1994
|
|
|
|
Copyright (C) 1993-2000 Yukihiro Matsumoto
|
|
|
|
**********************************************************************/
|
|
|
|
#include "ruby.h"
|
|
#include <math.h>
|
|
|
|
VALUE rb_mMath;
|
|
|
|
#define Need_Float(x) (x) = rb_Float(x)
|
|
#define Need_Float2(x,y) {\
|
|
Need_Float(x);\
|
|
Need_Float(y);\
|
|
}
|
|
|
|
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));
|
|
}
|
|
|
|
static VALUE
|
|
math_cos(obj, x)
|
|
VALUE obj, x;
|
|
{
|
|
Need_Float(x);
|
|
|
|
return rb_float_new(cos(RFLOAT(x)->value));
|
|
}
|
|
|
|
static VALUE
|
|
math_sin(obj, x)
|
|
VALUE obj, x;
|
|
{
|
|
Need_Float(x);
|
|
|
|
return rb_float_new(sin(RFLOAT(x)->value));
|
|
}
|
|
|
|
static VALUE
|
|
math_tan(obj, x)
|
|
VALUE obj, x;
|
|
{
|
|
Need_Float(x);
|
|
|
|
return rb_float_new(tan(RFLOAT(x)->value));
|
|
}
|
|
|
|
static VALUE
|
|
math_exp(obj, x)
|
|
VALUE obj, x;
|
|
{
|
|
Need_Float(x);
|
|
return rb_float_new(exp(RFLOAT(x)->value));
|
|
}
|
|
|
|
static VALUE
|
|
math_log(obj, x)
|
|
VALUE obj, x;
|
|
{
|
|
Need_Float(x);
|
|
return rb_float_new(log(RFLOAT(x)->value));
|
|
}
|
|
|
|
static VALUE
|
|
math_log10(obj, x)
|
|
VALUE obj, x;
|
|
{
|
|
Need_Float(x);
|
|
return rb_float_new(log10(RFLOAT(x)->value));
|
|
}
|
|
|
|
static VALUE
|
|
math_sqrt(obj, x)
|
|
VALUE obj, x;
|
|
{
|
|
Need_Float(x);
|
|
|
|
if (RFLOAT(x)->value < 0.0) rb_raise(rb_eArgError, "square root for negative number");
|
|
return rb_float_new(sqrt(RFLOAT(x)->value));
|
|
}
|
|
|
|
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));
|
|
}
|
|
|
|
static VALUE
|
|
math_ldexp(obj, x, n)
|
|
VALUE obj, x, n;
|
|
{
|
|
double d;
|
|
|
|
Need_Float(x);
|
|
return rb_float_new(d = ldexp(RFLOAT(x)->value, NUM2INT(n)));
|
|
}
|
|
|
|
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, "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);
|
|
}
|