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gallery.m: clean and vectorize part of qmult. * scripts/special-matrix/gallery.m: make qmult() follow Octave guidelines, vectorize last for loop in qmult().
author Antonio Pino Robles <data.script93@gmail.com>
date Thu, 28 May 2015 18:32:47 +0200
parents 9fc020886ae9
children 7503499a252b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 ## Copyright (C) 1999-2015 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} =} prism ()
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21 ## @deftypefnx {Function File} {@var{map} =} prism (@var{n})
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22 ## Create color colormap. This colormap cycles through red, orange, yellow,
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23 ## green, blue and violet with each index change.
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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 ## PKG_ADD: colormap ("register", "prism");
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32 ## PKG_DEL: colormap ("unregister", "prism");
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33
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34 function map = prism (n = rows (colormap ()))
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35
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36 if (nargin > 1)
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37 print_usage ();
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38 elseif (! isscalar (n))
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39 error ("prism: N must be a scalar");
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40 endif
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41
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42 if (n == 1)
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43 map = [1 0 0];
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44 elseif (n > 1)
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45 C = [1, 0, 0; 1, 1/2, 0; 1, 1, 0; 0, 1, 0; 0, 0, 1; 2/3, 0, 1];
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46 map = C(rem (0:(n-1), 6) + 1, :);
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47 else
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48 map = zeros (0, 3);
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49 endif
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50
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51 endfunction
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52
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53
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54 %!demo
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55 %! ## Show the 'prism' colormap as an image
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56 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64));
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57 %! axis ([1, 64, 0, 1], "ticy", "xy");
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58 %! colormap (prism (64));
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59