compiler/stdc/math/s_ccosf.c

   1 /*      $OpenBSD: s_ccosf.c,v 1.2 2010/07/18 18:42:26 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 /*                                                      ccosf()
  19  *
  20  *      Complex circular cosine
  21  *
  22  *
  23  *
  24  * SYNOPSIS:
  25  *
  26  * void ccosf();
  27  * cmplxf z, w;
  28  *
  29  * ccosf( &z, &w );
  30  *
  31  *
  32  *
  33  * DESCRIPTION:
  34  *
  35  * If
  36  *     z = x + iy,
  37  *
  38  * then
  39  *
  40  *     w = cos x  cosh y  -  i sin x sinh y.
  41  *
  42  *
  43  *
  44  * ACCURACY:
  45  *
  46  *                      Relative error:
  47  * arithmetic   domain     # trials      peak         rms
  48  *    IEEE      -10,+10     30000       1.8e-7       5.5e-8
  49  */
  50
  51 #include <complex.h>
  52 #include "math.h"
  53 #include "math_private.h"
  54
  55 /* calculate cosh and sinh */
  56
  57 float complex
  58 ccosf(float complex z)
  59 {
  60
  61         return (ccoshf(CMPLXF(-cimagf(z), crealf(z))));
  62 }
  63