Mercurial > octave
view scripts/image/iscolormap.m @ 33528:6813c5c7e1b9 default tip @
Update to gnulib revision 6213c5bd72d15ca5e1ea9c34122899e02fed448c.
* bootstrap.conf: Update GNULIB_REVISION that contains a fix for a build issue
when targeting Cygwin.
author | Markus Mützel <markus.muetzel@gmx.de> |
---|---|
date | Fri, 03 May 2024 16:04:05 +0200 |
parents | 2e484f9f1f18 |
children |
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######################################################################## ## ## Copyright (C) 2012-2024 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## 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 ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {@var{tf} =} iscolormap (@var{cmap}) ## Return true if @var{cmap} is a colormap. ## ## A colormap is a real matrix, of class single or double, with 3 columns. ## Each row represents a single color. The 3 columns contain red, green, ## and blue intensities respectively. ## ## All values in a colormap should be in the [0 1] range but this is not ## enforced. Each function must decide what to do for values outside this ## range. ## ## @seealso{colormap, rgbplot} ## @end deftypefn function tf = iscolormap (cmap) if (nargin < 1) print_usage (); endif tf = isnumeric (cmap) && isreal (cmap) && isfloat (cmap) ... && ndims (cmap) == 2 && columns (cmap) == 3; endfunction %!assert (iscolormap (jet (64))) %!assert (iscolormap ({0 1 0}), false) %!assert (iscolormap ([0 1i 0]), false) %!assert (iscolormap (ones (3,3,3)), false) %!assert (iscolormap (ones (3,4)), false)