64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/* $OpenBSD: s_cacosl.c,v 1.3 2011/07/20 21:02:51 martynas 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.
|
|
*/
|
|
|
|
/* cacosl()
|
|
*
|
|
* Complex circular arc cosine
|
|
*
|
|
*
|
|
*
|
|
* SYNOPSIS:
|
|
*
|
|
* long double complex cacosl();
|
|
* long double complex z, w;
|
|
*
|
|
* w = cacosl( z );
|
|
*
|
|
*
|
|
*
|
|
* DESCRIPTION:
|
|
*
|
|
*
|
|
* w = arccos z = PI/2 - arcsin z.
|
|
*
|
|
*
|
|
*
|
|
*
|
|
* ACCURACY:
|
|
*
|
|
* Relative error:
|
|
* arithmetic domain # trials peak rms
|
|
* DEC -10,+10 5200 1.6e-15 2.8e-16
|
|
* IEEE -10,+10 30000 1.8e-14 2.2e-15
|
|
*/
|
|
|
|
#include <openlibm_complex.h>
|
|
#include <openlibm_math.h>
|
|
|
|
static const long double PIO2L = 1.570796326794896619231321691639751442098585L;
|
|
|
|
long double complex
|
|
cacosl(long double complex z)
|
|
{
|
|
long double complex w;
|
|
|
|
w = casinl(z);
|
|
w = (PIO2L - creall(w)) - cimagl(w) * I;
|
|
return (w);
|
|
}
|