1######################################################################## 2## 3## Copyright (C) 1999-2021 The Octave Project Developers 4## 5## See the file COPYRIGHT.md in the top-level directory of this 6## distribution or <https://octave.org/copyright/>. 7## 8## This file is part of Octave. 9## 10## Octave is free software: you can redistribute it and/or modify it 11## under the terms of the GNU General Public License as published by 12## the Free Software Foundation, either version 3 of the License, or 13## (at your option) any later version. 14## 15## Octave is distributed in the hope that it will be useful, but 16## WITHOUT ANY WARRANTY; without even the implied warranty of 17## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18## GNU General Public License for more details. 19## 20## You should have received a copy of the GNU General Public License 21## along with Octave; see the file COPYING. If not, see 22## <https://www.gnu.org/licenses/>. 23## 24######################################################################## 25 26## -*- texinfo -*- 27## @deftypefn {} {@var{map} =} white () 28## @deftypefnx {} {@var{map} =} white (@var{n}) 29## Create color colormap. This colormap is completely white. 30## 31## The argument @var{n} must be a scalar. 32## If unspecified, the length of the current colormap, or 64, is used. 33## @seealso{colormap} 34## @end deftypefn 35 36function map = white (n) 37 38 if (nargin > 1) 39 print_usage (); 40 elseif (nargin == 1) 41 if (! isscalar (n)) 42 error ("white: N must be a scalar"); 43 endif 44 n = double (n); 45 else 46 hf = get (0, "currentfigure"); 47 if (! isempty (hf)) 48 n = rows (get (hf, "colormap")); 49 else 50 n = 64; 51 endif 52 endif 53 map = ones (n, 3); 54 55endfunction 56 57 58%!demo 59%! ## Show the 'white' colormap profile and as an image 60%! cmap = white (256); 61%! subplot (2, 1, 1); 62%! rgbplot (cmap, "composite"); 63%! subplot (2, 1, 2); 64%! rgbplot (cmap); 65