Mercurial > octave
view scripts/image/spring.m @ 22323:bac0d6f07a3e
maint: Update copyright notices for 2016.
author | John W. Eaton <jwe@octave.org> |
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date | Wed, 17 Aug 2016 01:05:19 -0400 |
parents | 1c4cd12987f5 |
children | 3a2b891d0b33 3ac9f9ecfae5 |
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## Copyright (C) 1999-2016 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 {} {@var{map} =} spring () ## @deftypefnx {} {@var{map} =} spring (@var{n}) ## Create color colormap. This colormap varies from magenta to yellow. ## ## 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> function map = spring (n = rows (colormap ())) if (nargin > 1) print_usage (); elseif (! isscalar (n)) error ("spring: N must be a scalar"); endif n = double (n); if (n == 1) map = [1, 0, 1]; elseif (n > 1) r = ones (n, 1); g = [0:(n-1)]' / (n - 1); b = 1 - g; map = [r, g, b]; else map = zeros (0, 3); endif endfunction %!demo %! ## Show the 'spring' colormap profile and as an image %! cmap = spring (256); %! subplot (2, 1, 1); %! rgbplot (cmap, "composite"); %! subplot (2, 1, 2); %! rgbplot (cmap);