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[project @ 1995-01-11 20:30:04 by jwe]
author jwe
date Wed, 11 Jan 1995 20:30:04 +0000
parents 3470f1e25a79
children 611d403c7f3d
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1 # Copyright (C) 1995 John W. Eaton
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2 #
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3 # This file is part of Octave.
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4 #
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5 # Octave is free software; you can redistribute it and/or modify it
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6 # under the terms of the GNU General Public License as published by the
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7 # Free Software Foundation; either version 2, or (at your option) any
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8 # later version.
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9 #
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10 # Octave is distributed in the hope that it will be useful, but WITHOUT
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11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 # for more details.
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14 #
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15 # You should have received a copy of the GNU General Public License
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16 # along with Octave; see the file COPYING. If not, write to the Free
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17 # Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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18
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19 function x = imagesc (x, zoom)
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20
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21 # Scale and display a matrix as an image.
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22 #
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23 # imagesc(x) displays a scaled version of the matrix x. The matrix is
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24 # scaled so that its entries are indices into the current colormap.
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25 # The scaled matrix is returned.
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26 #
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27 # imagesc (x, zoom) sets the magnification, the default value is 4.
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28 #
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29 # SEE ALSO: image, imshow
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30
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31 # Written by Tony Richardson (amr@mpl.ucsd.edu) July 1994.
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32
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33 if (nargin < 1 || nargin > 2)
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34 usage ("image (matrix, [zoom])");
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35 elseif (nargin == 1)
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36 zoom = 4;
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37 endif
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38
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39 [ high, wide ] = size (x);
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40
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41 maxval = max (max (x));
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42 minval = min (min (x));
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43
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44 # Rescale matrix so that all values are in the range 0 to
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45 # length (colormap) inclusive.
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46
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47 if (maxval == minval)
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48 x = ones (high, wide);
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49 else
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50 # Rescale values to between 1 and length (colormap) inclusive.
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51 x = fix ((x - minval) / (maxval - minval) * (length (colormap) - 1)) + 1;
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52 endif
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53
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54 image (x, zoom);
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55
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56 endfunction