/usr/share/plplot_octave/bone.m is in octave-plplot 5.13.0+dfsg-6ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | ## Copyright (C) 1998-2003 Joao Cardoso.
##
## 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.
##
## This file is part of plplot_octave.
## b = bone(m)
##
## Gray-scale with a tinge of blue color map.
## bone(M) returns an M-by-3 matrix containing a "bone" colormap.
## without arguments, cmap has lenght 64
function cmap = bone(m)
if (nargin != 1)
m = 64;
endif
cmap = (7*gray(m) + fliplr(hot(m)))/8;
endfunction
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