Trailing-Edge
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PDP-10 Archives
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SRI_NIC_PERM_FS_1_19910112
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c/lib5/pml/complex/ccosh.c
There are no other files named ccosh.c in the archive.
/*
* +++ NAME +++
*
* CCOSH Complex double precision hyperbolic cosine
*
* +++ INDEX +++
*
* CCOSH
* machine independent routines
* complex functions
* math libraries
*
* +++ DESCRIPTION +++
*
* Computes double precision complex hyperbolic cosine of
* a double precision complex argument.
* The result replaces the argument.
*
* +++ USAGE +++
*
* ccosh(z)
* COMPLEX *z;
*
* +++ REFERENCES +++
*
*
* +++ RESTRICTIONS +++
*
*
* +++ PROGRAMMER +++
*
* Fred Fish
* Goodyear Aerospace Corp, Arizona Div.
* (602) 932-7000 work
* (602) 894-6881 home
*
* +++ INTERNALS +++
*
* Computes complex hyperbolic cosine of Z = x + j y from:
*
* CCOSH(z) = 0.5 * ( CEXP(z) + CEXP(-z) )
*
* ---
*/
/*)LIBRARY
*/
#include <stdio.h>
#include "c:pmluse.h"
#include "pml.h"
ccosh(z)
register COMPLEX *z;
{
COMPLEX cexpmz;
cexpmz.real = -z->real;
cexpmz.imag = -z->imag;
cexp(&cexpmz);
cexp(z);
z->real += cexpmz.real;
z->imag += cexpmz.imag;
z->real *= 0.5;
z->imag *= 0.5;
}