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math.c
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math.c
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/************************************************
math.c -
$Author$
$Date$
created at: Tue Jan 25 14:12:56 JST 1994
Copyright (C) 1993-1999 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, x, y)
VALUE obj, x, y;
{
Need_Float2(x, y);
return rb_float_new(atan2(RFLOAT(x)->value, RFLOAT(y)->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);
}