Mercurial > octave-nkf
view scripts/sparse/spy.m @ 5164:57077d0ddc8e
[project @ 2005-02-25 19:55:24 by jwe]
author | jwe |
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date | Fri, 25 Feb 2005 19:55:28 +0000 |
parents | |
children | 32c569794216 |
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## Copyright (C) 1998-2004 Andy Adler ## ## This program is free software; you can redistribute it and/or modify ## it under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 2 of the License, or ## (at your option) any later version. ## ## This program is distributed in the hope that it will be useful, ## but WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ## GNU General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with this program; if not, write to the Free Software ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA ## -*- texinfo -*- ## @deftypefn {Function File} {} spy (@var{x}) ## Plot the sparsity pattern of the sparse matrix @var{x}. ## @end deftypefn function spy(S) if issparse(S) [i,j,s,m,n]= spfind(S); else [i,j,s] = find(S); [m,n] = size(S); endif arp = automatic_replot; unwind_protect automatic_replot = 0; eval(sprintf('gset nokey')) eval(sprintf('gset yrange [0:%d] reverse',m+1)) eval(sprintf('gset xrange [0:%d] noreverse',n+1)) if (length(i)<1000) plot(j,i,'*'); else plot(j,i,'.'); endif #TODO: we should store the reverse state so we don't undo it gset yrange [0:1] noreverse axis; unwind_protect_cleanup automatic_replot = arp; end_unwind_protect endfunction