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1 ## Copyright (C) 2004, 2005, 2007 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 if (issparse (s)) |
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27 [i, j, v, m, n] = spfind (s); |
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28 else |
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29 [i, j, v] = find (s); |
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30 [m, n] = size (s); |
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31 end |
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32 s = sparse (i, j, 1, m, n); |
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33 endfunction |
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34 |
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35 %!assert(issparse(spones([1,2;3,0]))) |
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36 %!assert(spones([1,2;3,0]),sparse([1,1;1,0])) |
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37 %!assert(spones(sparse([1,2;3,0])),sparse([1,1;1,0])) |
