1 |
|
|
/* $OpenBSD: s_cacosf.c,v 1.2 2011/07/20 19:28:33 martynas Exp $ */ |
2 |
|
|
/* |
3 |
|
|
* Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net> |
4 |
|
|
* |
5 |
|
|
* Permission to use, copy, modify, and distribute this software for any |
6 |
|
|
* purpose with or without fee is hereby granted, provided that the above |
7 |
|
|
* copyright notice and this permission notice appear in all copies. |
8 |
|
|
* |
9 |
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
10 |
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
11 |
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
12 |
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
13 |
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
14 |
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
15 |
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
16 |
|
|
*/ |
17 |
|
|
|
18 |
|
|
/* cacosf() |
19 |
|
|
* |
20 |
|
|
* Complex circular arc cosine |
21 |
|
|
* |
22 |
|
|
* |
23 |
|
|
* |
24 |
|
|
* SYNOPSIS: |
25 |
|
|
* |
26 |
|
|
* void cacosf(); |
27 |
|
|
* cmplxf z, w; |
28 |
|
|
* |
29 |
|
|
* cacosf( &z, &w ); |
30 |
|
|
* |
31 |
|
|
* |
32 |
|
|
* |
33 |
|
|
* DESCRIPTION: |
34 |
|
|
* |
35 |
|
|
* |
36 |
|
|
* w = arccos z = PI/2 - arcsin z. |
37 |
|
|
* |
38 |
|
|
* |
39 |
|
|
* |
40 |
|
|
* |
41 |
|
|
* ACCURACY: |
42 |
|
|
* |
43 |
|
|
* Relative error: |
44 |
|
|
* arithmetic domain # trials peak rms |
45 |
|
|
* IEEE -10,+10 30000 9.2e-6 1.2e-6 |
46 |
|
|
* |
47 |
|
|
*/ |
48 |
|
|
|
49 |
|
|
#include <complex.h> |
50 |
|
|
#include <math.h> |
51 |
|
|
|
52 |
|
|
float complex |
53 |
|
|
cacosf(float complex z) |
54 |
|
|
{ |
55 |
|
|
float complex w; |
56 |
|
|
|
57 |
|
|
w = casinf( z ); |
58 |
|
|
w = ((float)M_PI_2 - crealf (w)) - cimagf (w) * I; |
59 |
|
|
return (w); |
60 |
|
|
} |