GRASS GIS 8 Programmer's Manual 8.3.2(2024)-exported
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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
9#include <stdlib.h>
10#include "ccmath.h"
11
12void hmgen(Cpx *h, double *ev, Cpx *u, int n)
13{
14 Cpx *v, *p;
15
16 int i, j;
17
18 double e;
19
20 v = (Cpx *)calloc(n * n, sizeof(Cpx));
21 cmcpy(v, u, n * n);
22 hconj(v, n);
23 for (i = 0, p = v; i < n; ++i) {
24 for (j = 0, e = ev[i]; j < n; ++j, ++p) {
25 p->re *= e;
26 p->im *= e;
27 }
28 }
29 cmmul(h, u, v, n);
30 free(v);
31}
void cmmul(Cpx *c, Cpx *a, Cpx *b, int n)
Definition cmmul.c:11
void cmcpy(Cpx *a, Cpx *b, int n)
Definition cmcpy.c:11
void hconj(Cpx *u, int n)
Definition hconj.c:11
void hmgen(Cpx *h, double *ev, Cpx *u, int n)
Definition hmgen.c:12
double re
Definition ccmath.h:39
double im
Definition ccmath.h:39