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1 ## Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, |
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2 ## 2007, 2008, 2009 Andy Adler |
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3 ## |
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4 ## This file is part of Octave. |
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5 ## |
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6 ## Octave is free software; you can redistribute it and/or modify it |
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7 ## under the terms of the GNU General Public License as published by |
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8 ## the Free Software Foundation; either version 3 of the License, or (at |
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9 ## your option) any later version. |
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10 ## |
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11 ## Octave is distributed in the hope that it will be useful, but |
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 ## General Public License for more details. |
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15 ## |
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16 ## You should have received a copy of the GNU General Public License |
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17 ## along with Octave; see the file COPYING. If not, see |
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18 ## <http://www.gnu.org/licenses/>. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} spy (@var{x}) |
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22 ## @deftypefnx {Function File} {} spy (@dots{}, @var{markersize}) |
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23 ## @deftypefnx {Function File} {} spy (@dots{}, @var{line_spec}) |
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24 ## Plot the sparsity pattern of the sparse matrix @var{x}. If the argument |
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25 ## @var{markersize} is given as an scalar value, it is used to determine the |
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26 ## point size in the plot. If the string @var{line_spec} is given it is |
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27 ## passed to @code{plot} and determines the appearance of the plot. |
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28 ## @seealso{plot} |
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29 ## @end deftypefn |
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30 |
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31 function spy (x, varargin) |
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32 |
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33 if (nargin < 1) |
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34 print_usage (); |
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35 endif |
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36 |
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37 markersize = NaN; |
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38 if (numel (i) < 1000) |
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39 line_spec = "*"; |
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40 else |
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41 line_spec = "."; |
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42 endif |
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43 for i = 1:length (varargin) |
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44 if (ischar (varargin{i})) |
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45 line_spec = varargin{i}; |
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46 elseif (isscalar (varargin{i})) |
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47 markersize = varargin{i}; |
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48 else |
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49 error ("spy: expected markersize or linespec"); |
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50 endif |
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51 endfor |
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52 |
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53 [i, j, s] = find (x); |
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54 [m, n] = size (x); |
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55 |
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56 if (isnan (markersize)) |
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57 plot (j, i, line_spec); |
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58 else |
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59 plot (j, i, line_spec, "markersize", markersize); |
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60 endif |
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61 |
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62 axis ([0, n+1, 0, m+1], "ij"); |
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63 |
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64 endfunction |
