diff FIXES/imagesc.m @ 0:6b33357c7561 octave-forge

Initial revision
author pkienzle
date Wed, 10 Oct 2001 19:54:49 +0000
parents
children b93249567aa0
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FIXES/imagesc.m	Wed Oct 10 19:54:49 2001 +0000
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+## Copyright (C) 1996, 1997 John W. Eaton
+##
+## This file is part of Octave.
+##
+## Octave 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, or (at your option)
+## any later version.
+##
+## Octave 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 Octave; see the file COPYING.  If not, write to the Free
+## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+## 02111-1307, USA.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} imagesc (@var{A}, @var{zoom})
+## @deftypefnx {Function File} {} imagesc (@var{x}, @var{y}, @var{A}, @var{zoom})
+## Display a scaled version of the matrix @var{A} as a color image.  The
+## matrix is scaled so that its entries are indices into the current
+## colormap.  The scaled matrix is returned.  If @var{zoom} is omitted, a
+## comfortable size is chosen.
+##
+## The axis values corresponding to the matrix elements are specified in
+## @var{x} and @var{y}.  At present they are ignored.
+## @end deftypefn
+## @seealso{image and imshow}
+
+## Author: Tony Richardson <arichard@stark.cc.oh.us>
+## Created: July 1994
+## Adapted-By: jwe
+
+function ret = imagesc (x, y, A, zoom)
+
+  if (nargin < 1 || nargin > 4)
+    usage ("imagesc (matrix, zoom) or imagesc (x, y, matrix, zoom)");
+  elseif (nargin == 1)
+    A = x;
+    zoom = [];
+    x = y = [];
+  elseif (nargin == 2)
+    A = x;
+    zoom = y;
+    x = y = [];
+  elseif (nargin == 3)
+    zoom = [];
+  endif
+
+  ## Rescale values to between 1 and length (colormap) inclusive.
+  maxval = max (A (:));
+  minval = min (A (:));
+  if (maxval == minval)
+    B = ones ( size (A) );
+  else
+    B = round ((A - minval) / (maxval - minval) * (rows (colormap) - 1)) + 1;
+  endif
+
+  if ( nargout > 0 )
+    ret = B;
+  else
+    image (x, y, B, zoom);
+  endif
+
+endfunction