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1 ## Copyright (C) 2004 David Bateman & Andy Adler |
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2 ## |
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3 ## This program is free software; you can redistribute it and/or modify |
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4 ## it under the terms of the GNU General Public License as published by |
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5 ## the Free Software Foundation; either version 2 of the License, or |
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6 ## (at your option) any later version. |
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7 ## |
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8 ## This program is distributed in the hope that it will be useful, |
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 ## GNU General Public License for more details. |
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12 ## |
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13 ## You should have received a copy of the GNU General Public License |
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14 ## along with this program; if not, write to the Free Software |
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15 ## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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16 ## 02110-1301 USA |
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17 |
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18 ## -*- texinfo -*- |
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19 ## @deftypefn {Function File} {@var{y} =} spones (@var{x}) |
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20 ## Replace the non-zero entries of @var{x} with ones. This creates a |
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21 ## sparse matrix with the same structure as @var{x}. |
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22 ## @end deftypefn |
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23 |
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24 function s = spones(s) |
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25 if issparse(s) |
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26 [i,j,v,m,n] = spfind(s); |
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27 else |
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28 [i,j,v] = find(s); |
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29 [m,n] = size(s); |
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30 end |
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31 s = sparse(i,j,1,m,n); |
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32 endfunction |
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33 |
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34 %!assert(issparse(spones([1,2;3,0]))) |
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35 %!assert(spones([1,2;3,0]),sparse([1,1;1,0])) |
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36 %!assert(spones(sparse([1,2;3,0])),sparse([1,1;1,0])) |
