cvmul.c

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/*  cvmul.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 "ccmath.h"
 
void cvmul(Cpx *u, Cpx *a, Cpx *v, int n)
{
    Cpx *q;
 
    int i, j;
 
    for (i = 0; i < n; ++i, ++u) {
        u->re = u->im = 0.;
        for (j = 0, q = v; j < n; ++j, ++a, ++q) {
            u->re += a->re * q->re - a->im * q->im;
            u->im += a->im * q->re + a->re * q->im;
        }
    }
}
 
Cpx cvnrm(Cpx *u, Cpx *v, int n)
{
    int k;
 
    Cpx z;
 
    z.re = z.im = 0.;
    for (k = 0; k < n; ++k, ++u, ++v) {
        z.re += u->re * v->re + u->im * v->im;
        z.im += u->re * v->im - u->im * v->re;
    }
    return z;
}