Mercurial > octave-nkf
view scripts/image/flag.m @ 7016:93c65f2a5668
[project @ 2007-10-12 06:40:56 by jwe]
author | jwe |
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date | Fri, 12 Oct 2007 06:41:26 +0000 |
parents | 9a179efae6bb |
children | a1dbe9d80eee |
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## Copyright (C) 1999,2000 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} {} flag (@var{n}) ## Create color colormap. This colormap cycles through red, white, blue ## and black. The argument @var{n} should be a scalar. If it ## is omitted, the length of the current colormap or 64 is assumed. ## @seealso{colormap} ## @end deftypefn ## Author: Kai Habel <kai.habel@gmx.de> ## flag(number) gives a colormap consists of red, white, blue and black ## changing with each index function map = flag (number) if (nargin == 0) number = rows (colormap); elseif (nargin == 1) if (! isscalar (number)) error ("flag: argument must be a scalar"); endif else print_usage (); endif p = [1, 0, 0; 1, 1, 1; 0, 0, 1; 0, 0, 0]; if (rem(number,4) == 0) map = kron (ones (number / 4, 1), p); else map = [kron (ones (fix (number / 4), 1), p); p(1:rem (number, 4), :)]; endif endfunction