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/* utrncm.c CCMATH mathematics library source code.
*
* Copyright (C) 2000 Daniel A. Atkinson All rights reserved.
* This code may be redistributed under the terms of the GNU library
* public license (LGPL). ( See the lgpl.license file for details.)
* ------------------------------------------------------------------------
*/
#include <stdlib.h>
#include "ccmath.h"
void utrncm(Cpx *cm, Cpx *a, Cpx *b, int n)
{
Cpx z, *q0, *p, *s, *t;
int i, j, k;
q0 = (Cpx *)calloc(n, sizeof(Cpx));
for (i = 0; i < n; ++i, ++cm) {
for (j = 0, t = b; j < n; ++j) {
z.re = z.im = 0.;
for (k = 0, s = a + i * n; k < n; ++k, ++s, ++t) {
z.re += t->re * s->re + t->im * s->im;
z.im += t->im * s->re - t->re * s->im;
}
q0[j] = z;
}
for (j = 0, p = cm, t = a; j < n; ++j, p += n) {
z.re = z.im = 0.;
for (k = 0, s = q0; k < n; ++k, ++t, ++s) {
z.re += t->re * s->re - t->im * s->im;
z.im += t->im * s->re + t->re * s->im;
}
*p = z;
}
}
free(q0);
}
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