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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{A}, @var{zoom}) |
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22 ## @deftypefnx {Function File} {} imagesc (@var{x}, @var{y}, @var{A}, @var{zoom}) |
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23 ## Display a scaled version of the matrix @var{A} as a color image. The |
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24 ## matrix is scaled so that its entries are indices into the current |
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25 ## colormap. The scaled matrix is returned. If @var{zoom} is omitted, a |
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26 ## comfortable size is chosen. |
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27 ## |
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28 ## The axis values corresponding to the matrix elements are specified in |
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29 ## @var{x} and @var{y}. At present they are ignored. |
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30 ## @end deftypefn |
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31 ## @seealso{image and imshow} |
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32 |
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33 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
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34 ## Created: July 1994 |
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35 ## Adapted-By: jwe |
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36 |
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37 function ret = imagesc (x, y, A, zoom) |
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38 |
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39 if (nargin < 1 || nargin > 4) |
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40 usage ("imagesc (matrix, zoom) or imagesc (x, y, matrix, zoom)"); |
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41 elseif (nargin == 1) |
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42 A = x; |
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43 zoom = []; |
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44 x = y = []; |
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45 elseif (nargin == 2) |
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46 A = x; |
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47 zoom = y; |
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48 x = y = []; |
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49 elseif (nargin == 3) |
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50 zoom = []; |
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51 endif |
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52 |
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53 maxval = max (A(:)); |
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54 minval = min (A(:)); |
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55 |
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56 if (maxval == minval) |
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57 B = ones (size (A)); |
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58 else |
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59 ## Rescale values to between 1 and length (colormap) inclusive. |
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60 B = round ((A - minval) / (maxval - minval) * (rows (colormap) - 1)) + 1; |
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61 endif |
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62 |
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63 if (nargout == 0) |
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64 image (x, y, B, zoom); |
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65 else |
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66 ret = B; |
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67 endif |
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68 |
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69 endfunction |
