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annotate scripts/image/jet.m @ 13485:59d266f7ed89

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Removed plotter tab.
author Jacob Dawid <jacob.dawid@googlemail.com>
date Wed, 27 Apr 2011 14:21:28 +0200
parents c792872f8942
children 72c96de7a403
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John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1999-2011 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} =} jet ()
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21 ## @deftypefnx {Function File} {@var{map} =} jet (@var{n})
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22 ## Create color colormap. This colormap ranges from dark blue through blue,
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23 ## cyan, green, yellow, red, to dark red.
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24 ## The argument @var{n} must be a scalar.
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25 ## If unspecified, the length of the current colormap, or 64, is used.
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26 ## @seealso{colormap}
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27 ## @end deftypefn
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28
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29 ## Author: Kai Habel <kai.habel@gmx.de>
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30
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31 function map = jet (n)
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32
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33 if (nargin == 0)
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34 n = rows (colormap);
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35 elseif (nargin == 1)
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36 if (! isscalar (n))
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37 error ("jet: argument must be a scalar");
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38 endif
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39 else
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40 print_usage ();
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41 endif
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42
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43 if (n == 1)
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44 map = [0, 0, 0.5];
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45 elseif (n > 1)
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46 x = linspace(0, 1, n)';
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47 r = (x >= 3/8 & x < 5/8) .* (4 * x - 3/2)\
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48 + (x >= 5/8 & x < 7/8) + (x >= 7/8) .* (-4 * x + 9/2);
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49 g = (x >= 1/8 & x < 3/8) .* (4 * x - 1/2)\
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50 + (x >= 3/8 & x < 5/8) + (x >= 5/8 & x < 7/8) .* (-4 * x + 7/2);
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51 b = (x < 1/8) .* (4 * x + 1/2) + (x >= 1/8 & x < 3/8)\
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52 + (x >= 3/8 & x < 5/8) .* (-4 * x + 5/2);
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53 map = [r, g, b];
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54 else
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55 map = [];
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56 endif
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57
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58 endfunction
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59
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60 %!demo
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61 %! ## Show the 'jet' colormap as an image
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62 %! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)')
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63 %! axis ([1, 64, 0, 1], "ticy", "xy")
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64 %! colormap (jet (64))
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65