mirror of
https://git.planet-casio.com/Lephenixnoir/OpenLibm.git
synced 2025-04-03 17:17:13 +02:00
08dbb2b517
If we ship with a separate copy of <complex.h>, we should also use this one instead of the one provided by the system.
84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
/* $OpenBSD: s_ccosf.c,v 1.2 2010/07/18 18:42:26 guenther Exp $ */
|
|
/*
|
|
* Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
/* ccosf()
|
|
*
|
|
* Complex circular cosine
|
|
*
|
|
*
|
|
*
|
|
* SYNOPSIS:
|
|
*
|
|
* void ccosf();
|
|
* cmplxf z, w;
|
|
*
|
|
* ccosf( &z, &w );
|
|
*
|
|
*
|
|
*
|
|
* DESCRIPTION:
|
|
*
|
|
* If
|
|
* z = x + iy,
|
|
*
|
|
* then
|
|
*
|
|
* w = cos x cosh y - i sin x sinh y.
|
|
*
|
|
*
|
|
*
|
|
* ACCURACY:
|
|
*
|
|
* Relative error:
|
|
* arithmetic domain # trials peak rms
|
|
* IEEE -10,+10 30000 1.8e-7 5.5e-8
|
|
*/
|
|
|
|
#include <openlibm.h>
|
|
#include <openlibm_complex.h>
|
|
|
|
/* calculate cosh and sinh */
|
|
|
|
static void
|
|
_cchshf(float xx, float *c, float *s)
|
|
{
|
|
float x, e, ei;
|
|
|
|
x = xx;
|
|
if(fabsf(x) <= 0.5f) {
|
|
*c = coshf(x);
|
|
*s = sinhf(x);
|
|
}
|
|
else {
|
|
e = expf(x);
|
|
ei = 0.5f/e;
|
|
e = 0.5f * e;
|
|
*s = e - ei;
|
|
*c = e + ei;
|
|
}
|
|
}
|
|
|
|
float complex
|
|
ccosf(float complex z)
|
|
{
|
|
float complex w;
|
|
float ch, sh;
|
|
|
|
_cchshf( cimagf(z), &ch, &sh );
|
|
w = cosf( crealf(z) ) * ch + ( -sinf( crealf(z) ) * sh) * I;
|
|
return (w);
|
|
}
|