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[project @ 2000-01-19 08:49:56 by jwe]
author jwe
date Wed, 19 Jan 2000 08:50:14 +0000
parents 69b167451491
children c2305b99fbd7
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1 ## Copyright (C) 1996, 1997 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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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} imagesc (@var{x}, @var{zoom})
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22 ## Display a scaled version of the matrix @var{x} as a color image. The
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23 ## matrix is scaled so that its entries are indices into the current
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24 ## colormap. The scaled matrix is returned. If @var{zoom} is omitted, a
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25 ## value of 4 is assumed.
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26 ## @end deftypefn
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27 ## @seealso{image and imshow}
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29 ## Author: Tony Richardson <arichard@stark.cc.oh.us>
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30 ## Created: July 1994
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31 ## Adapted-By: jwe
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32
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33 function y = imagesc (x, zoom)
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34
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35 if (nargin < 1 || nargin > 2)
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36 usage ("imagesc (matrix, [zoom])");
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37 elseif (nargin == 1)
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38 zoom = 4;
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39 endif
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40
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41 [ high, wide ] = size (x);
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42
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43 maxval = max (max (x));
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44 minval = min (min (x));
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45
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46 ## Rescale matrix so that all values are in the range 0 to
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47 ## length (colormap) inclusive.
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48
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49 if (maxval == minval)
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50 y = ones (high, wide);
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51 else
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52 ## Rescale values to between 1 and length (colormap) inclusive.
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53 y = round ((x - minval) / (maxval - minval) * (rows (colormap) - 1)) + 1;
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54 endif
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55
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56 image (y, zoom);
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57
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58 endfunction