|
Chris@82
|
1 /*
|
|
Chris@82
|
2 * Copyright (c) 2003, 2007-14 Matteo Frigo
|
|
Chris@82
|
3 * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
|
|
Chris@82
|
4 *
|
|
Chris@82
|
5 * This program is free software; you can redistribute it and/or modify
|
|
Chris@82
|
6 * it under the terms of the GNU General Public License as published by
|
|
Chris@82
|
7 * the Free Software Foundation; either version 2 of the License, or
|
|
Chris@82
|
8 * (at your option) any later version.
|
|
Chris@82
|
9 *
|
|
Chris@82
|
10 * This program is distributed in the hope that it will be useful,
|
|
Chris@82
|
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Chris@82
|
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
Chris@82
|
13 * GNU General Public License for more details.
|
|
Chris@82
|
14 *
|
|
Chris@82
|
15 * You should have received a copy of the GNU General Public License
|
|
Chris@82
|
16 * along with this program; if not, write to the Free Software
|
|
Chris@82
|
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
Chris@82
|
18 *
|
|
Chris@82
|
19 */
|
|
Chris@82
|
20
|
|
Chris@82
|
21
|
|
Chris@82
|
22 #include "dft/dft.h"
|
|
Chris@82
|
23
|
|
Chris@82
|
24 /* fill a complex array with zeros. */
|
|
Chris@82
|
25 static void recur(const iodim *dims, int rnk, R *ri, R *ii)
|
|
Chris@82
|
26 {
|
|
Chris@82
|
27 if (rnk == RNK_MINFTY)
|
|
Chris@82
|
28 return;
|
|
Chris@82
|
29 else if (rnk == 0)
|
|
Chris@82
|
30 ri[0] = ii[0] = K(0.0);
|
|
Chris@82
|
31 else if (rnk > 0) {
|
|
Chris@82
|
32 INT i, n = dims[0].n;
|
|
Chris@82
|
33 INT is = dims[0].is;
|
|
Chris@82
|
34
|
|
Chris@82
|
35 if (rnk == 1) {
|
|
Chris@82
|
36 /* this case is redundant but faster */
|
|
Chris@82
|
37 for (i = 0; i < n; ++i)
|
|
Chris@82
|
38 ri[i * is] = ii[i * is] = K(0.0);
|
|
Chris@82
|
39 } else {
|
|
Chris@82
|
40 for (i = 0; i < n; ++i)
|
|
Chris@82
|
41 recur(dims + 1, rnk - 1, ri + i * is, ii + i * is);
|
|
Chris@82
|
42 }
|
|
Chris@82
|
43 }
|
|
Chris@82
|
44 }
|
|
Chris@82
|
45
|
|
Chris@82
|
46
|
|
Chris@82
|
47 void X(dft_zerotens)(tensor *sz, R *ri, R *ii)
|
|
Chris@82
|
48 {
|
|
Chris@82
|
49 recur(sz->dims, sz->rnk, ri, ii);
|
|
Chris@82
|
50 }
|
