## Mercurial > hg > octave-max

### view scripts/sparse/spones.m @ 15489:481417a57a2d

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improve sign and signbit docs
* mappers.cc (Fsign): Note sign (-0) is 0. Add @seealso for signbit.
(Fsignbit): Add @seealso for sign.

author | John W. Eaton <jwe@octave.org> |
---|---|

date | Thu, 04 Oct 2012 10:20:59 -0400 |

parents | f3d52523cde1 |

children |

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## Copyright (C) 2004-2012 David Bateman and Andy Adler ## ## This file is part of Octave. ## ## Octave 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 3 of the License, or (at ## your option) any later version. ## ## Octave 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 Octave; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {@var{r} =} spones (@var{S}) ## Replace the non-zero entries of @var{S} with ones. This creates a ## sparse matrix with the same structure as @var{S}. ## @end deftypefn function r = spones (S) if (nargin != 1) print_usage (); endif [i, j, v] = find (S); [m, n] = size (S); r = sparse (i, j, 1, m, n); endfunction %!assert (issparse (spones ([1,2;3,0]))) %!assert (spones ([1,2;3,0]), sparse ([1,1;1,0])) %!assert (spones (sparse ([1,2;3,0])), sparse ([1,1;1,0]))