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1 ## Copyright (C) 1998-2004 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} {} spy (@var{x}) |
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20 ## Plot the sparsity pattern of the sparse matrix @var{x}. |
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21 ## @end deftypefn |
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22 |
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23 function spy (S) |
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24 |
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25 if (issparse (S)) |
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26 [i, j, s, m, n] = spfind (S); |
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27 else |
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28 [i, j, s] = find (S); |
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29 [m, n] = size (S); |
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30 endif |
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31 |
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32 if (numel (i) < 1000) |
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33 plot (j, i, "*"); |
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34 else |
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35 plot (j, i, "."); |
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36 endif |
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37 |
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38 axis ([0, n+1, m+1, 0]); |
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39 |
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40 endfunction |
