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annotate scripts/image/summer.m @ 17535:c12c688a35ed default tip lyh

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Fix warnings
author LYH <lyh.kernel@gmail.com>
date Fri, 27 Sep 2013 17:43:27 +0800
parents 1a800034d443
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 1999-2012 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} {@var{map} =} summer ()
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21 ## @deftypefnx {Function File} {@var{map} =} summer (@var{n})
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22 ## Create color colormap. This colormap varies from green to yellow.
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23 ## The argument @var{n} must be a scalar.
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24 ## If unspecified, the length of the current colormap, or 64, is used.
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25 ## @seealso{colormap}
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26 ## @end deftypefn
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27
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28 ## Author: Kai Habel <kai.habel@gmx.de>
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29 ## Date: 06/03/2000
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30
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31 ## PKG_ADD: colormap ("register", "summer");
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32 ## PKG_DEL: colormap ("unregister", "summer");
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33
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34 function map = summer (n)
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35
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36 if (nargin == 0)
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37 n = rows (colormap);
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38 elseif (nargin == 1)
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39 if (! isscalar (n))
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40 error ("summer: N must be a scalar");
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41 endif
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42 else
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43 print_usage ();
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44 endif
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45
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46 if (n == 1)
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47 map = [0, 0.5, 0.4];
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48 elseif (n > 1)
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49 r = [0:(n-1)]' / (n - 1);
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50 g = 0.5 + r / 2;
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51 b = 0.4 * ones (n, 1);
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52 map = [r, g, b];
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53 else
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54 map = zeros (0, 3);
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55 endif
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56
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57 endfunction
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58
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59
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60 %!demo
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61 %! ## Show the 'summer' colormap as an image
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62 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64));
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63 %! axis ([1, 64, 0, 1], "ticy", "xy");
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64 %! colormap (summer (64));
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65