1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
/*
* Copyright (c) 2003 Matteo Frigo
* Copyright (c) 2003 Massachusetts Institute of Technology
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/* $Id: zero.c,v 1.1 2008/10/17 06:11:08 scuri Exp $ */
#include "dft.h"
/* fill a complex array with zeros. */
static void recur(const iodim *dims, int rnk, R *ri, R *ii)
{
if (rnk == RNK_MINFTY)
return;
else if (rnk == 0)
ri[0] = ii[0] = K(0.0);
else if (rnk > 0) {
int i, n = dims[0].n;
int is = dims[0].is;
if (rnk == 1) {
/* this case is redundant but faster */
for (i = 0; i < n; ++i)
ri[i * is] = ii[i * is] = K(0.0);
} else {
for (i = 0; i < n; ++i)
recur(dims + 1, rnk - 1, ri + i * is, ii + i * is);
}
}
}
void X(dft_zerotens)(tensor *sz, R *ri, R *ii)
{
recur(sz->dims, sz->rnk, ri, ii);
}
|
