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92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
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/* $NetBSD: ctan.c,v 1.1 2007/08/20 16:01:37 drochner Exp $ */
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/*-
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* Copyright (c) 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software written by Stephen L. Moshier.
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* It is redistributed by the NetBSD Foundation by permission of the author.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* imported and modified include for newlib 2010/10/03
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* Marco Atzeri <marco_atzeri@yahoo.it>
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*/
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/*
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FUNCTION
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<<ctan>>, <<ctanf>>---complex tangent
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INDEX
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ctan
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INDEX
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ctanf
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ANSI_SYNOPSIS
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#include <complex.h>
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double complex ctan(double complex <[z]>);
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float complex ctanf(float complex <[z]>);
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DESCRIPTION
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These functions compute the complex tangent of <[z]>.
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<<ctanf>> is identical to <<ctan>>, except that it performs
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its calculations on <<floats complex>>.
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RETURNS
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These functions return the complex tangent value.
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PORTABILITY
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<<ctan>> and <<ctanf>> are ISO C99
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QUICKREF
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<<ctan>> and <<ctanf>> are ISO C99
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*/
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#include <complex.h>
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#include <math.h>
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#include "cephes_subr.h"
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double complex
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ctan(double complex z)
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{
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double complex w;
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double d;
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d = cos(2.0 * creal(z)) + cosh(2.0 * cimag(z));
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if (fabs(d) < 0.25)
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d = _ctans(z);
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if (d == 0.0) {
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/* mtherr ("ctan", OVERFLOW); */
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w = HUGE_VAL + HUGE_VAL * I;
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return w;
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}
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w = sin(2.0 * creal(z)) / d + (sinh(2.0 * cimag(z)) / d) * I;
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return w;
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}
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