gonzui

    1: /*      $OpenBSD: s_catanhf.c,v 1.1 2008/09/07 20:36:09 martynas 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: /*                                                      catanhf
   19:  *
   20:  *      Complex inverse hyperbolic tangent
   21:  *
   22:  *
   23:  *
   24:  * SYNOPSIS:
   25:  *
   26:  * float complex catanhf();
   27:  * float complex z, w;
   28:  *
   29:  * w = catanhf (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 <math.h>
   47: 
   48: float complex
   49: catanhf(float complex z)
   50: {
   51:         float complex w;
   52: 
   53:         w = -1.0f * I * catanf (z * I);
   54:         return (w);
   55: }