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/ccos.c
There are no other files named ccos.c in the archive.
/*
* +++ NAME +++
*
* CCOS Complex double precision cosine
*
* +++ INDEX +++
*
* CCOS
* complex functions
* machine independent routines
* math libraries
*
* +++ DESCRIPTION +++
*
* Computes double precision complex cosine of
* a double precision complex argument.
* The result replaces the argument.
*
* +++ USAGE +++
*
* ccos(z)
* COMPLEX *z;
*
* +++ REFERENCES +++
*
* Fortran 77 user's guide, Digital Equipment Corp. pp B-12
*
* +++ RESTRICTIONS +++
*
*
* +++ PROGRAMMER +++
*
* Fred Fish
* Goodyear Aerospace Corp, Arizona Div.
* (602) 932-7000 work
* (602) 894-6881 home
*
* +++ INTERNALS +++
*
* Computes complex cosine of Z = x + j y from:
*
* 1. R_CCOS = DCOS(x) * DCOSH(y)
*
* 2. I_CCOS = -DSIN(x) * DSINH(y)
*
* Then CCOS(z) = R_CCOS + j I_CCOS
*
* ---
*/
/*)LIBRARY
*/
#include <stdio.h>
#include "c:pmluse.h"
#include "pml.h"
ccos(z)
register COMPLEX *z;
{
double r_ccos, i_ccos, dsin(), dcos(), dsinh(), dcosh();
r_ccos = dcos(z->real) * dcosh(z->imag);
i_ccos = -dsin(z->real) * dsinh(z->imag);
z->real = r_ccos;
z->imag = i_ccos;
}