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annotate scripts/image/imagesc.m @ 2311:2b5788792cad

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[project @ 1996-07-11 20:18:38 by jwe]
author jwe
date Thu, 11 Jul 1996 20:18:38 +0000
parents 5cffc4b8de57
children 204cc7db6f4a
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1 ### Copyright (C) 1996 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
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7 ### the Free Software Foundation; either version 2, or (at your option)
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8 ### any later version.
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9 ###
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10 ### Octave is distributed in the hope that it will be useful, but
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11 ### WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ### General Public License 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, 59 Temple Place - Suite 330, Boston, MA
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18 ### 02111-1307, USA.
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20 ## Scale and display a matrix as an image.
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21 ##
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22 ## imagesc(x) displays a scaled version of the matrix x. The matrix is
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23 ## scaled so that its entries are indices into the current colormap.
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24 ## The scaled matrix is returned.
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25 ##
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26 ## imagesc (x, zoom) sets the magnification, the default value is 4.
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27 ##
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28 ## SEE ALSO: image, imshow
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30 function x = imagesc (x, zoom)
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32 ## Written by Tony Richardson (amr@mpl.ucsd.edu) July 1994.
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34 if (nargin < 1 || nargin > 2)
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35 usage ("image (matrix, [zoom])");
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36 elseif (nargin == 1)
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37 zoom = 4;
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38 endif
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39
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40 [ high, wide ] = size (x);
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41
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42 maxval = max (max (x));
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43 minval = min (min (x));
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45 ## Rescale matrix so that all values are in the range 0 to
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46 ## length (colormap) inclusive.
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48 if (maxval == minval)
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49 x = ones (high, wide);
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50 else
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51 ## Rescale values to between 1 and length (colormap) inclusive.
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52 x = fix ((x - minval) / (maxval - minval) * (length (colormap) - 1)) + 1;
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53 endif
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54
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55 image (x, zoom);
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56
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57 endfunction