Mercurial > forge
view main/image/flag.m @ 756:7b93ae40a2f5 octave-forge
Remove reference to global variable __current_colormap__; we need to do
this because the semantics of global have changed so that a new symbol
is created as empty if no default has been defined, which in turn means
that exist("__some_global__") now returns true even if __some_global__
wasn't previously defined.
author | pkienzle |
---|---|
date | Thu, 30 Jan 2003 17:52:26 +0000 |
parents | 6b33357c7561 |
children |
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## Copyright (C) 1999,2000 Kai Habel ## ## This program 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 2 of the License, or ## (at your option) any later version. ## ## This program 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 this program; if not, write to the Free Software ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA ## -*- texinfo -*- ## @deftypefn {Function File} {} flag (@var{n}) ## Create color colormap. ## (cycling 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. ## @end deftypefn ## @seealso{colormap} ## 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 (! is_scalar (number)) error ("flag: argument must be a scalar"); endif else usage ("flag (number)"); 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