1 /* $OpenBSD: s_ccosh.c,v 1.6 2013/07/03 04:46:36 espie 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 /* ccosh 19 * 20 * Complex hyperbolic cosine 21 * 22 * 23 * 24 * SYNOPSIS: 25 * 26 * double complex ccosh(); 27 * double complex z, w; 28 * 29 * w = ccosh (z); 30 * 31 * 32 * 33 * DESCRIPTION: 34 * 35 * ccosh(z) = cosh x cos y + i sinh x sin y . 36 * 37 * ACCURACY: 38 * 39 * Relative error: 40 * arithmetic domain # trials peak rms 41 * IEEE -10,+10 30000 2.9e-16 8.1e-17 42 * 43 */ 44 45 #include <complex.h> 46 #include <float.h> 47 #include <math.h> 48 49 double complex 50 ccosh(double complex z) 51 { 52 double complex w; 53 double x, y; 54 55 x = creal(z); 56 y = cimag(z); 57 w = cosh (x) * cos (y) + (sinh (x) * sin (y)) * I; 58 return (w); 59 } 60 61 #if LDBL_MANT_DIG == DBL_MANT_DIG 62 __strong_alias(ccoshl, ccosh); 63 #endif /* LDBL_MANT_DIG == DBL_MANT_DIG */ 64