Mercurial > octave-nkf
view scripts/image/prism.m @ 19025:a66548dc07b0 stable release-3-8-2
Version 3.8.2 released.
* configure.ac (OCTAVE_VERSION): Now 3.8.2.
(OCTAVE_MINOR_VERSION): Now 2.
(OCTAVE_RELEASE_DATE): Set to 2014-06-06.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Thu, 07 Aug 2014 11:41:28 -0400 |
parents | d63878346099 |
children | e8e3a89fa370 |
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## Copyright (C) 1999-2013 Kai Habel ## ## This file is part of Octave. ## ## Octave is free software; you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 3 of the License, or (at ## your option) any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ## General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {@var{map} =} prism () ## @deftypefnx {Function File} {@var{map} =} prism (@var{n}) ## Create color colormap. This colormap cycles through red, orange, yellow, ## green, blue and violet with each index change. ## The argument @var{n} must be a scalar. ## If unspecified, the length of the current colormap, or 64, is used. ## @seealso{colormap} ## @end deftypefn ## Author: Kai Habel <kai.habel@gmx.de> ## PKG_ADD: colormap ("register", "prism"); ## PKG_DEL: colormap ("unregister", "prism"); function map = prism (n) if (nargin == 0) n = rows (colormap); elseif (nargin == 1) if (! isscalar (n)) error ("prism: N must be a scalar"); endif else print_usage (); endif if (n == 1) map = [1 0 0]; elseif (n > 1) C = [1, 0, 0; 1, 1/2, 0; 1, 1, 0; 0, 1, 0; 0, 0, 1; 2/3, 0, 1]; map = C(rem (0:(n-1), 6) + 1, :); else map = zeros (0, 3); endif endfunction %!demo %! ## Show the 'prism' colormap as an image %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); %! axis ([1, 64, 0, 1], "ticy", "xy"); %! colormap (prism (64));