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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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16 |
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17 ## -*- texinfo -*- |
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18 ## @deftypefn {Function File} {} spy (@var{x}) |
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19 ## Plot the sparsity pattern of the sparse matrix @var{x}. |
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20 ## @end deftypefn |
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21 |
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22 function spy(S) |
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23 if issparse(S) |
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24 [i,j,s,m,n]= spfind(S); |
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25 else |
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26 [i,j,s] = find(S); |
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27 [m,n] = size(S); |
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28 endif |
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29 |
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30 arp = automatic_replot; |
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31 unwind_protect |
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32 automatic_replot = 0; |
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33 |
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34 eval(sprintf('gset nokey')) |
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35 eval(sprintf('gset yrange [0:%d] reverse',m+1)) |
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36 eval(sprintf('gset xrange [0:%d] noreverse',n+1)) |
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37 |
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38 if (length(i)<1000) |
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39 plot(j,i,'*'); |
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40 else |
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41 plot(j,i,'.'); |
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42 endif |
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43 |
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44 #TODO: we should store the reverse state so we don't undo it |
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45 gset yrange [0:1] noreverse |
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46 axis; |
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47 unwind_protect_cleanup |
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48 automatic_replot = arp; |
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49 end_unwind_protect |
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50 endfunction |
