Mercurial > jwe > octave
view scripts/image/gray.m @ 20852:516bb87ea72e
2015 Code Sprint: remove class of function from docstring for all m-files.
author | Rik <rik@octave.org> |
---|---|
date | Sat, 12 Dec 2015 07:31:00 -0800 |
parents | 0338dc274ec5 |
children | 894239974868 |
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## Copyright (C) 1994-2015 John W. Eaton ## ## 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} =} gray () ## @deftypefnx {} {@var{map} =} gray (@var{n}) ## Create gray colormap. This colormap varies from black to white with shades ## of gray. ## ## 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: Tony Richardson <arichard@stark.cc.oh.us> ## Created: July 1994 ## Adapted-By: jwe ## PKG_ADD: colormap ("register", "gray"); ## PKG_DEL: colormap ("unregister", "gray"); function map = gray (n = rows (colormap ())) if (nargin > 1) print_usage (); elseif (! isscalar (n)) error ("gray: N must be a scalar"); endif n = double (n); if (n == 1) map = [0, 0, 0]; elseif (n > 1) gr = [0:(n-1)]' / (n - 1); map = [gr, gr, gr]; else map = zeros (0, 3); endif endfunction %!demo %! ## Show the 'gray' colormap profile and as an image %! cmap = gray (16); %! subplot (2, 1, 1); %! rgbplot (cmap, "composite"); %! subplot (2, 1, 2); %! rgbplot (cmap);