61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
/* $OpenBSD: s_catanh.c,v 1.6 2013/07/03 04:46:36 espie Exp $ */
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/*
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* Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* catanh
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*
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* Complex inverse hyperbolic tangent
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*
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*
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*
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* SYNOPSIS:
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*
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* double complex catanh();
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* double complex z, w;
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*
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* w = catanh (z);
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*
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*
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*
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* DESCRIPTION:
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*
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* Inverse tanh, equal to -i catan (iz);
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*
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* ACCURACY:
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*
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* Relative error:
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* arithmetic domain # trials peak rms
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* IEEE -10,+10 30000 2.3e-16 6.2e-17
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*
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*/
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#include <float.h>
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#include <openlibm_complex.h>
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#include <openlibm_math.h>
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double complex
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catanh(double complex z)
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{
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double complex w;
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w = -1.0 * I * catan (z * I);
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return (w);
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}
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#if LDBL_MANT_DIG == DBL_MANT_DIG
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__strong_alias(catanhl, catanh);
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#endif /* LDBL_MANT_DIG == DBL_MANT_DIG */
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