1 ## Copyright (C) 2004-2012 David Bateman and Andy Adler
3 ## This file is part of Octave.
5 ## Octave is free software; you can redistribute it and/or modify it
6 ## under the terms of the GNU General Public License as published by
7 ## the Free Software Foundation; either version 3 of the License, or (at
8 ## your option) any later version.
10 ## Octave is distributed in the hope that it will be useful, but
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 ## General Public License for more details.
15 ## You should have received a copy of the GNU General Public License
16 ## along with Octave; see the file COPYING. If not, see
17 ## <http://www.gnu.org/licenses/>.
20 ## @deftypefn {Function File} {@var{r} =} spones (@var{S})
21 ## Replace the non-zero entries of @var{S} with ones. This creates a
22 ## sparse matrix with the same structure as @var{S}.
25 function r = spones (S)
34 r = sparse (i, j, 1, m, n);
38 %!assert(issparse(spones([1,2;3,0])))
39 %!assert(spones([1,2;3,0]),sparse([1,1;1,0]))
40 %!assert(spones(sparse([1,2;3,0])),sparse([1,1;1,0]))