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comparison scripts/sparse/gplot.m @ 5576:7e008607a86e

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[project @ 2005-12-13 19:05:54 by jwe]
author jwe
date Tue, 13 Dec 2005 19:05:55 +0000
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children 6ada1581e8b4
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5575:9b4d9dbe88f7 5576:7e008607a86e
1 ## Copyright (C) 2005 Ivana Varekova
2 ##
3 ## This program is free software; you can redistribute it and/or modify
4 ## it under the terms of the GNU General Public License as published by
5 ## the Free Software Foundation; either version 2 of the License, or
6 ## (at your option) any later version.
7 ##
8 ## This program is distributed in the hope that it will be useful,
9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 ## GNU General Public License for more details.
12 ##
13 ## You should have received a copy of the GNU General Public License
14 ## along with this program; if not, write to the Free Software
15 ## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 ## 02110-1301 USA
17
18 ## -*- texinfo -*-
19 ## @deftypefn {Function File} {} gplot (@var{a}, @var{xy})
20 ## @deftypefnx {Function File} {} gplot (@var{a}, @var{xy}, @var{LineSpec})
21 ## @deftypefnx {Function File} {[@var{x}, @var{y}] =} gplot (@var{a}, @var{xy})
22 ## Plots a graph defined by @var{A} and @var{xy} in the graph theory sense.
23 ## @var{A} is the adjacency matrix of the array to be plotted and @var{xy} is a
24 ## @var{n}-by-2 matrix containing the coordinates of the nodes of the graph.
25 ##
26 ## If defined, @var{LineStyle} defines the output style for the plot. Called
27 ## with no output arguments the graph is plotted directly. Called with output
28 ## arguments the coordinates of the plot are returned in @var{x} and @var{y},
29 ## rather than being plotted.
30 ## @end deftypefn
31 ## @seealso{treeplot,etreeplot,spy}
32
33 function [x, y] = gplot (A, xy, LineStyle)
34
35 if (nargin < 2 || nargin > 3 || nargout > 2)
36 error ("gplot: wrong number of input/output arguments");
37 endif
38
39 if (nargin == 2)
40 LineStyle = "1;;";
41 endif
42
43 [i,j] = find(A);
44 xcoord = [xy(i,1), xy(j,1), NaN * ones(length(i),1)]'(:);
45 ycoord = [xy(i,2), xy(j,2), NaN * ones(length(i),1)]'(:);
46
47 if (nargout == 0)
48 plot(xcoord,ycoord,LineStyle);
49 else
50 x = xcoord;
51 y = ycoord;
52 endif
53
54 endfunction