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comparison scripts/sparse/spy.m @ 5164:57077d0ddc8e

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[project @ 2005-02-25 19:55:24 by jwe]
author jwe
date Fri, 25 Feb 2005 19:55:28 +0000
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children 32c569794216
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5163:9f3299378193 5164:57077d0ddc8e
1 ## Copyright (C) 1998-2004 Andy Adler
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16
17 ## -*- texinfo -*-
18 ## @deftypefn {Function File} {} spy (@var{x})
19 ## Plot the sparsity pattern of the sparse matrix @var{x}.
20 ## @end deftypefn
21
22 function spy(S)
23 if issparse(S)
24 [i,j,s,m,n]= spfind(S);
25 else
26 [i,j,s] = find(S);
27 [m,n] = size(S);
28 endif
29
30 arp = automatic_replot;
31 unwind_protect
32 automatic_replot = 0;
33
34 eval(sprintf('gset nokey'))
35 eval(sprintf('gset yrange [0:%d] reverse',m+1))
36 eval(sprintf('gset xrange [0:%d] noreverse',n+1))
37
38 if (length(i)<1000)
39 plot(j,i,'*');
40 else
41 plot(j,i,'.');
42 endif
43
44 #TODO: we should store the reverse state so we don't undo it
45 gset yrange [0:1] noreverse
46 axis;
47 unwind_protect_cleanup
48 automatic_replot = arp;
49 end_unwind_protect
50 endfunction