cannam@127: /*
cannam@127:  * Copyright (c) 2003, 2007-14 Matteo Frigo
cannam@127:  * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
cannam@127:  *
cannam@127:  * This program is free software; you can redistribute it and/or modify
cannam@127:  * it under the terms of the GNU General Public License as published by
cannam@127:  * the Free Software Foundation; either version 2 of the License, or
cannam@127:  * (at your option) any later version.
cannam@127:  *
cannam@127:  * This program is distributed in the hope that it will be useful,
cannam@127:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
cannam@127:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
cannam@127:  * GNU General Public License for more details.
cannam@127:  *
cannam@127:  * You should have received a copy of the GNU General Public License
cannam@127:  * along with this program; if not, write to the Free Software
cannam@127:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
cannam@127:  *
cannam@127:  */
cannam@127: 
cannam@127: 
cannam@127: #include "dft.h"
cannam@127: 
cannam@127: /* fill a complex array with zeros. */
cannam@127: static void recur(const iodim *dims, int rnk, R *ri, R *ii)
cannam@127: {
cannam@127:      if (rnk == RNK_MINFTY)
cannam@127:           return;
cannam@127:      else if (rnk == 0)
cannam@127:           ri[0] = ii[0] = K(0.0);
cannam@127:      else if (rnk > 0) {
cannam@127:           INT i, n = dims[0].n;
cannam@127:           INT is = dims[0].is;
cannam@127: 
cannam@127: 	  if (rnk == 1) {
cannam@127: 	       /* this case is redundant but faster */
cannam@127: 	       for (i = 0; i < n; ++i)
cannam@127: 		    ri[i * is] = ii[i * is] = K(0.0);
cannam@127: 	  } else {
cannam@127: 	       for (i = 0; i < n; ++i)
cannam@127: 		    recur(dims + 1, rnk - 1, ri + i * is, ii + i * is);
cannam@127: 	  }
cannam@127:      }
cannam@127: }
cannam@127: 
cannam@127: 
cannam@127: void X(dft_zerotens)(tensor *sz, R *ri, R *ii)
cannam@127: {
cannam@127:      recur(sz->dims, sz->rnk, ri, ii);
cannam@127: }