xref: /dflybsd-src/contrib/openbsd_libm/src/s_casinh.c (revision 4382f29d99a100bd77a81697c2f699c11f6a472a)
1*05a0b428SJohn Marino /*	$OpenBSD: s_casinh.c,v 1.6 2013/07/03 04:46:36 espie Exp $	*/
2*05a0b428SJohn Marino /*
3*05a0b428SJohn Marino  * Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>
4*05a0b428SJohn Marino  *
5*05a0b428SJohn Marino  * Permission to use, copy, modify, and distribute this software for any
6*05a0b428SJohn Marino  * purpose with or without fee is hereby granted, provided that the above
7*05a0b428SJohn Marino  * copyright notice and this permission notice appear in all copies.
8*05a0b428SJohn Marino  *
9*05a0b428SJohn Marino  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10*05a0b428SJohn Marino  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11*05a0b428SJohn Marino  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12*05a0b428SJohn Marino  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13*05a0b428SJohn Marino  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14*05a0b428SJohn Marino  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15*05a0b428SJohn Marino  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16*05a0b428SJohn Marino  */
17*05a0b428SJohn Marino 
18*05a0b428SJohn Marino /*							casinh
19*05a0b428SJohn Marino  *
20*05a0b428SJohn Marino  *	Complex inverse hyperbolic sine
21*05a0b428SJohn Marino  *
22*05a0b428SJohn Marino  *
23*05a0b428SJohn Marino  *
24*05a0b428SJohn Marino  * SYNOPSIS:
25*05a0b428SJohn Marino  *
26*05a0b428SJohn Marino  * double complex casinh();
27*05a0b428SJohn Marino  * double complex z, w;
28*05a0b428SJohn Marino  *
29*05a0b428SJohn Marino  * w = casinh (z);
30*05a0b428SJohn Marino  *
31*05a0b428SJohn Marino  *
32*05a0b428SJohn Marino  *
33*05a0b428SJohn Marino  * DESCRIPTION:
34*05a0b428SJohn Marino  *
35*05a0b428SJohn Marino  * casinh z = -i casin iz .
36*05a0b428SJohn Marino  *
37*05a0b428SJohn Marino  * ACCURACY:
38*05a0b428SJohn Marino  *
39*05a0b428SJohn Marino  *                      Relative error:
40*05a0b428SJohn Marino  * arithmetic   domain     # trials      peak         rms
41*05a0b428SJohn Marino  *    IEEE      -10,+10     30000       1.8e-14     2.6e-15
42*05a0b428SJohn Marino  *
43*05a0b428SJohn Marino  */
44*05a0b428SJohn Marino 
45*05a0b428SJohn Marino #include <complex.h>
46*05a0b428SJohn Marino #include <float.h>
47*05a0b428SJohn Marino #include <math.h>
48*05a0b428SJohn Marino 
49*05a0b428SJohn Marino double complex
casinh(double complex z)50*05a0b428SJohn Marino casinh(double complex z)
51*05a0b428SJohn Marino {
52*05a0b428SJohn Marino 	double complex w;
53*05a0b428SJohn Marino 
54*05a0b428SJohn Marino 	w = -1.0 * I * casin (z * I);
55*05a0b428SJohn Marino 	return (w);
56*05a0b428SJohn Marino }
57*05a0b428SJohn Marino 
58*05a0b428SJohn Marino #if	LDBL_MANT_DIG == DBL_MANT_DIG
59*05a0b428SJohn Marino __strong_alias(casinhl, casinh);
60*05a0b428SJohn Marino #endif	/* LDBL_MANT_DIG == DBL_MANT_DIG */
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