1*05a0b428SJohn Marino /* $OpenBSD: s_catanhf.c,v 1.1 2008/09/07 20:36:09 martynas 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 /* catanhf
19*05a0b428SJohn Marino *
20*05a0b428SJohn Marino * Complex inverse hyperbolic tangent
21*05a0b428SJohn Marino *
22*05a0b428SJohn Marino *
23*05a0b428SJohn Marino *
24*05a0b428SJohn Marino * SYNOPSIS:
25*05a0b428SJohn Marino *
26*05a0b428SJohn Marino * float complex catanhf();
27*05a0b428SJohn Marino * float complex z, w;
28*05a0b428SJohn Marino *
29*05a0b428SJohn Marino * w = catanhf (z);
30*05a0b428SJohn Marino *
31*05a0b428SJohn Marino *
32*05a0b428SJohn Marino *
33*05a0b428SJohn Marino * DESCRIPTION:
34*05a0b428SJohn Marino *
35*05a0b428SJohn Marino * Inverse tanh, equal to -i catan (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 2.3e-16 6.2e-17
42*05a0b428SJohn Marino *
43*05a0b428SJohn Marino */
44*05a0b428SJohn Marino
45*05a0b428SJohn Marino #include <complex.h>
46*05a0b428SJohn Marino #include <math.h>
47*05a0b428SJohn Marino
48*05a0b428SJohn Marino float complex
catanhf(float complex z)49*05a0b428SJohn Marino catanhf(float complex z)
50*05a0b428SJohn Marino {
51*05a0b428SJohn Marino float complex w;
52*05a0b428SJohn Marino
53*05a0b428SJohn Marino w = -1.0f * I * catanf (z * I);
54*05a0b428SJohn Marino return (w);
55*05a0b428SJohn Marino }
56