Mercurial > forge
diff FIXES/imagesc.m @ 0:6b33357c7561 octave-forge
Initial revision
author | pkienzle |
---|---|
date | Wed, 10 Oct 2001 19:54:49 +0000 |
parents | |
children | b93249567aa0 |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/FIXES/imagesc.m Wed Oct 10 19:54:49 2001 +0000 @@ -0,0 +1,68 @@ +## 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