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[project @ 2005-12-13 19:20:14 by jwe]
author jwe
date Tue, 13 Dec 2005 19:20:14 +0000
parents 7e008607a86e
children 2618a0750ae6
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1 ## Copyright (C) 2005 Ivana Varekova
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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} {} gplot (@var{a}, @var{xy})
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20 ## @deftypefnx {Function File} {} gplot (@var{a}, @var{xy}, @var{line_style})
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21 ## @deftypefnx {Function File} {[@var{x}, @var{y}] =} gplot (@var{a}, @var{xy})
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22 ## Plot a graph defined by @var{A} and @var{xy} in the graph theory
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23 ## sense. @var{A} is the adjacency matrix of the array to be plotted
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24 ## and @var{xy} is an @var{n}-by-2 matrix containing the coordinates of
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25 ## the nodes of the graph.
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26 ##
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27 ## The optional parameter @var{line_style} defines the output style for
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28 ## the plot. Called with no output arguments the graph is plotted
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29 ## directly. Otherwise, return the coordinates of the plot in @var{x}
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30 ## and @var{y}.
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31 ## @end deftypefn
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32 ## @seealso{treeplot, etreeplot, spy}
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33
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34 function [x, y] = gplot (A, xy, line_style)
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35
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36 if (nargin < 2 || nargin > 3 || nargout > 2)
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37 usage ("gplot (a, xy, line_style)");
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38 endif
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39
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40 if (nargin == 2)
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41 line_style = "1;;";
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42 endif
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43
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44 [i, j] = find (A);
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45 xcoord = [xy(i,1), xy(j,1), NaN * ones(length(i),1)]'(:);
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46 ycoord = [xy(i,2), xy(j,2), NaN * ones(length(i),1)]'(:);
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47
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48 if (nargout == 0)
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49 plot (xcoord, ycoord, line_style);
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50 else
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51 x = xcoord;
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52 y = ycoord;
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53 endif
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54
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55 endfunction