home *** CD-ROM | disk | FTP | other *** search
- # Copyright (C) 1995 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, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- function x = imagesc (x, zoom)
-
- # 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
-
- # Written by Tony Richardson (amr@mpl.ucsd.edu) July 1994.
-
- if (nargin < 1 || nargin > 2)
- usage ("image (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)
- x = ones (high, wide);
- else
- # Rescale values to between 1 and length (colormap) inclusive.
- x = fix ((x - minval) / (maxval - minval) * (length (colormap) - 1)) + 1;
- endif
-
- image (x, zoom);
-
- endfunction
-