summaryrefslogtreecommitdiff
path: root/math.c
blob: 4af3cef96edd141ea4fcf86e2f0e14be54829066 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
/**********************************************************************

  math.c -

  $Author$
  $Date$
  created at: Tue Jan 25 14:12:56 JST 1994

  Copyright (C) 1993-2001 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_acos(obj, x)
    VALUE obj, x;
{
    Need_Float(x);
    /*
    if (RFLOAT(x)->value < -1.0 || RFLOAT(x)->value > 1.0)
	rb_raise(rb_eArgError, "Out of range (-1..1)");
    */
    return rb_float_new(acos(RFLOAT(x)->value));
}

static VALUE
math_asin(obj, x)
    VALUE obj, x;
{
    Need_Float(x);
    /*
    if (RFLOAT(x)->value < -1.0 || RFLOAT(x)->value > 1.0)
	rb_raise(rb_eArgError, "Out of range (-1..1)");
    */
    return rb_float_new(asin(RFLOAT(x)->value));
}

static VALUE
math_atan(obj, x)
    VALUE obj, x;
{
    Need_Float(x);
    return rb_float_new(atan(RFLOAT(x)->value));
}

static VALUE
math_cosh(obj, x)
    VALUE obj, x;
{
    Need_Float(x);
    return rb_float_new(cosh(RFLOAT(x)->value));
}

static VALUE
math_sinh(obj, x)
    VALUE obj, x;
{
    Need_Float(x);
    return rb_float_new(sinh(RFLOAT(x)->value));
}

static VALUE
math_tanh(obj, x)
    VALUE obj, x;
{
    Need_Float(x);
    return rb_float_new(tanh(RFLOAT(x)->value));
}

static VALUE
math_exp(obj, x)
    VALUE obj, x;
{
    Need_Float(x);
    return rb_float_new(exp(RFLOAT(x)->value));
}

#if defined __CYGWIN__
#define log(x) ((x) < 0.0 ? nan() : log(x))
#define log10(x) ((x) < 0.0 ? nan() : log10(x))
#endif

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)));
}

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));
}

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, "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);
}