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annotate scripts/image/rgbplot.m @ 15192:8367f326fa29

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Remove octave_value::is_real_nd_array cruft * ov-base.h (octave_base_value::is_real_nd_array): Remove function. * ov.h (octave_Value::is_real_nd_array): Remove function.
author Max Brister <max@2bass.com>
date Thu, 16 Aug 2012 18:57:45 -0500
parents e2a14d1b4eaa
children 4beb3a4bd440
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e2a14d1b4eaa rgbplot.m: Add new Matlab compatible function for plotting colormaps
Rik <octave@nomad.inbox5.com>
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1 ## Copyright (C) 2012 Rik Wehbring
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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 3 of the License, or (at
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8 ## your option) 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, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} rgbplot (@var{cmap})
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21 ## Plot the components of a colormap.
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22 ##
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23 ## The first column is plotted in red, the second column in green, and
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24 ## the third column in blue. The values are between 0 and 1 and represent
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25 ## the intensity of the RGB components in the given indexed color.
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26 ## @seealso{colormap}
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27 ## @end deftypefn
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28
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29 function rgbplot (cmap)
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30
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31 if (nargin != 1)
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32 print_usage ();
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33 endif
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34
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35 if (! ismatrix (cmap) || ndims (cmap) != 2 || columns (cmap) != 3)
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36 error ("rgbplot: CMAP must be a matrix of size Nx3");
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37 elseif (any (cmap(:) < 0) || any (cmap(:) > 1))
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38 error ("rgbplot: CMAP intensities must be in the range [0, 1]");
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39 endif
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40
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41 plot (cmap(:,1),"r", cmap(:,2),"g", cmap(:,3),"b");
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42 set (gca, 'ytick', 0:0.1:1);
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43 xlabel ("color index");
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44
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45 endfunction
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46
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47
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48 %!demo
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49 %! clf;
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50 %! rgbplot (ocean);
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51
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52 %%test input validation
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53 %!error rgbplot ()
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54 %!error rgbplot (1,2)
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55 %!error <CMAP must be a matrix of size Nx3> rgbplot ({0 1 0})
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56 %!error <CMAP must be a matrix of size Nx3> rgbplot (ones (3,3,3))
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57 %!error <CMAP must be a matrix of size Nx3> rgbplot (ones (3,4))
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58 %!error <CMAP intensities must be in the range> rgbplot ([0 0 -2])
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59 %!error <CMAP intensities must be in the range> rgbplot ([0 0 2])
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60