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Add demos for colormap functions
author Soren Hauberg <hauberg@gmail.com>
date Thu, 22 Oct 2009 12:18:56 -0400
parents 16f53d29049f
children 466ba499eff5
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16f53d29049f update copyright notices
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1999, 2000, 2007, 2009 Kai Habel
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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} {} winter (@var{n})
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21 ## Create color colormap. This colormap is blue to green.
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22 ## The argument @var{n} should be a scalar. If it
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23 ## is omitted, the length of the current colormap or 64 is assumed.
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24 ## @seealso{colormap}
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25 ## @end deftypefn
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26
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27 ## Author: Kai Habel <kai.habel@gmx.de>
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28
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29 function map = winter (number)
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30
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31 if (nargin == 0)
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32 number = rows (colormap);
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33 elseif (nargin == 1)
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34 if (! isscalar (number))
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35 error ("winter: argument must be a scalar");
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36 endif
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37 else
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38 print_usage ();
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39 endif
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40
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41 if (number == 1)
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42 map = [0, 0, 1];
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43 elseif (number > 1)
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44 r = zeros (number, 1);
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45 g = (0:number - 1)' ./ (number - 1);
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46 b = 1 - g ./ 2;
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47
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48 map = [r, g, b];
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49 else
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50 map = [];
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51 endif
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52
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53 endfunction
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Soren Hauberg <hauberg@gmail.com>
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54
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Soren Hauberg <hauberg@gmail.com>
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55 %!demo
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56 %! ## Show the 'winter' colormap as an image
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57 %! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
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58 %! axis ([1, 64, 0, 1], "ticy", "xy")
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59 %! colormap winter
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