mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-04 20:05:05 +00:00
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2003, 2007-14 Matteo Frigo
|
||
|
|
* Copyright (c) 2003, 2007-14 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#include "dft/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);
|
||
|
|
}
|