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50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/*
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* Copyright (c) 2003, 2007-14 Matteo Frigo
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* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include "dft/dft.h"
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/* fill a complex array with zeros. */
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static void recur(const iodim *dims, int rnk, R *ri, R *ii)
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{
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if (rnk == RNK_MINFTY)
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return;
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else if (rnk == 0)
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ri[0] = ii[0] = K(0.0);
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else if (rnk > 0) {
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INT i, n = dims[0].n;
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INT is = dims[0].is;
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if (rnk == 1) {
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/* this case is redundant but faster */
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for (i = 0; i < n; ++i)
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ri[i * is] = ii[i * is] = K(0.0);
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} else {
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for (i = 0; i < n; ++i)
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recur(dims + 1, rnk - 1, ri + i * is, ii + i * is);
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}
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}
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}
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void X(dft_zerotens)(tensor *sz, R *ri, R *ii)
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{
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recur(sz->dims, sz->rnk, ri, ii);
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}
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