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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 ## @deftypefnx {Function File} {} spy (@dots{}, @var{markersize}) |
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21 ## @deftypefnx {Function File} {} spy (@dots{}, @var{LineSpec}) |
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22 ## Plot the sparsity pattern of the sparse matrix @var{x}. If the argument |
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23 ## @var{markersize} is given as an scalar value, it is used to determine the |
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24 ## point size in the plot. If the string @var{LineSpec} is given it is |
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25 ## passed to @code{plot} and determines the appearance of the plot. |
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26 ## @seealso{plot} |
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27 ## @end deftypefn |
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28 |
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29 function spy (S, varargin) |
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30 |
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31 markersize = NaN; |
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32 if (numel (i) < 1000) |
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33 LineSpec = "*"; |
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34 else |
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35 LineSpec = "."; |
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36 endif |
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37 for i = 1:length(varargin) |
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38 if (ischar(varargin{i})) |
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39 LineSpec = varargin{i}; |
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40 elseif (isscalar (varargin{i})) |
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41 markersize = varargin{i}; |
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42 else |
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43 error ("spy: expected markersize or linespec"); |
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44 endif |
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45 endfor |
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46 |
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47 if (issparse (S)) |
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48 [i, j, s, m, n] = spfind (S); |
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49 else |
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50 [i, j, s] = find (S); |
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51 [m, n] = size (S); |
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52 endif |
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53 |
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54 if (isnan (markersize)) |
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55 plot (j, i, LineSpec); |
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56 else |
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57 plot (j, i, LineSpec, "MarkerSize", markersize); |
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58 endif |
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59 |
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60 axis ([0, n+1, m+1, 0], "ij"); |
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61 |
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62 endfunction |
