1######################################################################## 2## 3## Copyright (C) 2004-2021 The Octave Project Developers 4## 5## See the file COPYRIGHT.md in the top-level directory of this 6## distribution or <https://octave.org/copyright/>. 7## 8## This file is part of Octave. 9## 10## Octave is free software: you can redistribute it and/or modify it 11## under the terms of the GNU General Public License as published by 12## the Free Software Foundation, either version 3 of the License, or 13## (at your option) any later version. 14## 15## Octave is distributed in the hope that it will be useful, but 16## WITHOUT ANY WARRANTY; without even the implied warranty of 17## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18## GNU General Public License for more details. 19## 20## You should have received a copy of the GNU General Public License 21## along with Octave; see the file COPYING. If not, see 22## <https://www.gnu.org/licenses/>. 23## 24######################################################################## 25 26## -*- texinfo -*- 27## @deftypefn {} {@var{r} =} spones (@var{S}) 28## Replace the nonzero entries of @var{S} with ones. 29## 30## This creates a sparse matrix with the same structure as @var{S}. 31## @seealso{sparse, sprand, sprandn, sprandsym, spfun, spy} 32## @end deftypefn 33 34function r = spones (S) 35 36 if (nargin != 1) 37 print_usage (); 38 endif 39 40 [i, j, v] = find (S); 41 [m, n] = size (S); 42 43 r = sparse (i, j, 1, m, n); 44 45endfunction 46 47 48%!assert (issparse (spones ([1,2;3,0]))) 49%!assert (spones ([1,2;3,0]), sparse ([1,1;1,0])) 50%!assert (spones (sparse ([1,2;3,0])), sparse ([1,1;1,0])) 51