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[project @ 2007-10-12 21:27:11 by jwe]
author jwe
date Fri, 12 Oct 2007 21:27:37 +0000
parents 93c65f2a5668
children cadc73247d65
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1 ## Copyright (C) 2005, 2006, 2007 Ivana Varekova
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} gplot (@var{a}, @var{xy})
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21 ## @deftypefnx {Function File} {} gplot (@var{a}, @var{xy}, @var{line_style})
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22 ## @deftypefnx {Function File} {[@var{x}, @var{y}] =} gplot (@var{a}, @var{xy})
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23 ## Plot a graph defined by @var{A} and @var{xy} in the graph theory
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24 ## sense. @var{A} is the adjacency matrix of the array to be plotted
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25 ## and @var{xy} is an @var{n}-by-2 matrix containing the coordinates of
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26 ## the nodes of the graph.
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27 ##
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28 ## The optional parameter @var{line_style} defines the output style for
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29 ## the plot. Called with no output arguments the graph is plotted
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30 ## directly. Otherwise, return the coordinates of the plot in @var{x}
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31 ## and @var{y}.
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32 ## @seealso{treeplot, etreeplot, spy}
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33 ## @end deftypefn
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34
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35 function [x, y] = gplot (A, xy, line_style)
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36
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37 if (nargin < 2 || nargin > 3 || nargout > 2)
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38 print_usage ();
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39 endif
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40
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41 if (nargin == 2)
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42 line_style = "-";
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43 endif
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44
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45 [i, j] = find (A);
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46 xcoord = [xy(i,1), xy(j,1), NaN * ones(length(i),1)]'(:);
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47 ycoord = [xy(i,2), xy(j,2), NaN * ones(length(i),1)]'(:);
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48
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49 if (nargout == 0)
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50 plot (xcoord, ycoord, line_style);
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51 else
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52 x = xcoord;
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53 y = ycoord;
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54 endif
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55
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56 endfunction