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annotate scripts/sparse/spones.m @ 8920:eb63fbe60fab

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update copyright notices
author John W. Eaton <jwe@octave.org>
date Sat, 07 Mar 2009 10:41:27 -0500
parents f5005d9510f4
children 1bf0ce0930be
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8920
eb63fbe60fab update copyright notices
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2004, 2005, 2007, 2008 David Bateman & 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{y} =} spones (@var{x})
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21 ## Replace the non-zero entries of @var{x} with ones. This creates a
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22 ## sparse matrix with the same structure as @var{x}.
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23 ## @end deftypefn
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24
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25 function s = 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 s = 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]))