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annotate scripts/sparse/spones.m @ 14138:72c96de7a403 stable

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maint: update copyright notices for 2012
author John W. Eaton <jwe@octave.org>
date Mon, 02 Jan 2012 14:25:41 -0500
parents fd0a3ac60b0e
children f3d52523cde1
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14138
72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 2004-2012 David Bateman and Andy Adler
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {@var{r} =} spones (@var{S})
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21 ## Replace the non-zero entries of @var{S} with ones. This creates a
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22 ## sparse matrix with the same structure as @var{S}.
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23 ## @end deftypefn
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24
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25 function r = spones (S)
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26
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27 if (nargin != 1)
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28 print_usage ();
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29 endif
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30
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31 [i, j, v] = find (S);
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32 [m, n] = size (S);
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33
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34 r = sparse (i, j, 1, m, n);
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35
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36 endfunction
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37
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38 %!assert(issparse(spones([1,2;3,0])))
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39 %!assert(spones([1,2;3,0]),sparse([1,1;1,0]))
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40 %!assert(spones(sparse([1,2;3,0])),sparse([1,1;1,0]))