GRASS GIS 8 Programmer's Manual 8.2.0(2022)-exported
hmgen.c
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1/* hmgen.c CCMATH mathematics library source code.
2 *
3 * Copyright (C) 2000 Daniel A. Atkinson All rights reserved.
4 * This code may be redistributed under the terms of the GNU library
5 * public license (LGPL). ( See the lgpl.license file for details.)
6 * ------------------------------------------------------------------------
7 */
8#include <stdlib.h>
9#include "ccmath.h"
10void hmgen(Cpx * h, double *ev, Cpx * u, int n)
11{
12 Cpx *v, *p;
13
14 int i, j;
15
16 double e;
17
18 v = (Cpx *) calloc(n * n, sizeof(Cpx));
19 cmcpy(v, u, n * n);
20 hconj(v, n);
21 for (i = 0, p = v; i < n; ++i) {
22 for (j = 0, e = ev[i]; j < n; ++j, ++p) {
23 p->re *= e;
24 p->im *= e;
25 }
26 }
27 cmmul(h, u, v, n);
28 free(v);
29}
void cmmul(Cpx *c, Cpx *a, Cpx *b, int n)
Definition: cmmul.c:9
void cmcpy(Cpx *a, Cpx *b, int n)
Definition: cmcpy.c:9
void hconj(Cpx *u, int n)
Definition: hconj.c:9
void hmgen(Cpx *h, double *ev, Cpx *u, int n)
Definition: hmgen.c:10
Definition: ccmath.h:38
double re
Definition: ccmath.h:38
double im
Definition: ccmath.h:38