Mercurial > octave-nkf
view scripts/image/rgbplot.m @ 15517:3f1b306e2ba9
rgbplot: return graphics handle if requested
author | Carnë Draug <carandraug+dev@gmail.com> |
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date | Sat, 13 Oct 2012 21:53:21 +0200 |
parents | 4beb3a4bd440 |
children | dee69050bb02 |
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## Copyright (C) 2012 Rik Wehbring ## ## 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} {} rgbplot (@var{cmap}) ## @deftypefnx {Function File} {@var{h} =} rgbplot (@dots{}) ## Plot the components of a colormap. ## ## The first column is plotted in red, the second column in green, and ## the third column in blue. The values are between 0 and 1 and represent ## the intensity of the RGB components in the given indexed color. ## ## The optional return value @var{h} is a graphics handle to the created plot. ## ## @seealso{colormap} ## @end deftypefn function retval = rgbplot (cmap) if (nargin != 1) print_usage (); endif if (! iscolormap (cmap)) error ("rgbplot: CMAP must be a colormap"); endif h = plot (cmap(:,1),"r", cmap(:,2),"g", cmap(:,3),"b"); set (gca, 'ytick', 0:0.1:1); xlabel ("color index"); if (nargout > 0) retval = h; endif endfunction %!demo %! clf; %! rgbplot (ocean); %%test input validation %!error rgbplot () %!error rgbplot (1,2) %!error <CMAP must be a colormap> rgbplot ({0 1 0})