Mercurial > octave
view scripts/image/imagesc.m @ 3225:7aae2c3636a7
[project @ 1998-12-04 23:20:12 by jwe]
author | jwe |
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date | Fri, 04 Dec 1998 23:20:26 +0000 |
parents | 44d82b369c78 |
children | 36405da8e173 |
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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. ## Scale and display a matrix as an image. ## ## imagesc(x) displays a scaled version of the matrix x. The matrix is ## scaled so that its entries are indices into the current colormap. ## The scaled matrix is returned. ## ## imagesc (x, zoom) sets the magnification, the default value is 4. ## ## SEE ALSO: image, imshow ## Author: Tony Richardson <arichard@stark.cc.oh.us> ## Created: July 1994 ## Adapted-By: jwe function y = imagesc (x, zoom) if (nargin < 1 || nargin > 2) usage ("imagesc (matrix, [zoom])"); elseif (nargin == 1) zoom = 4; endif [ high, wide ] = size (x); maxval = max (max (x)); minval = min (min (x)); ## Rescale matrix so that all values are in the range 0 to ## length (colormap) inclusive. if (maxval == minval) y = ones (high, wide); else ## Rescale values to between 1 and length (colormap) inclusive. y = round ((x - minval) / (maxval - minval) * (rows (colormap) - 1)) + 1; endif image (y, zoom); endfunction