1 /* $OpenBSD: s_catanh.c,v 1.7 2016/09/12 19:47:02 guenther 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 /* catanh 19 * 20 * Complex inverse hyperbolic tangent 21 * 22 * 23 * 24 * SYNOPSIS: 25 * 26 * double complex catanh(); 27 * double complex z, w; 28 * 29 * w = catanh (z); 30 * 31 * 32 * 33 * DESCRIPTION: 34 * 35 * Inverse tanh, equal to -i catan (iz); 36 * 37 * ACCURACY: 38 * 39 * Relative error: 40 * arithmetic domain # trials peak rms 41 * IEEE -10,+10 30000 2.3e-16 6.2e-17 42 * 43 */ 44 45 #include <complex.h> 46 #include <float.h> 47 #include <math.h> 48 49 double complex 50 catanh(double complex z) 51 { 52 double complex w; 53 54 w = -1.0 * I * catan (z * I); 55 return (w); 56 } 57 DEF_STD(catanh); 58 LDBL_MAYBE_UNUSED_CLONE(catanh); 59