/usr/share/freemat/toolbox/graph/copper.m is in freemat-data 4.0-5.
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 | % COPPER COPPER Copper Colormap
%
% Usage
%
% Returns a copper colormap. The syntax for its use is
%
% y = copper
%
% Copyright (c) 2002-2006 Samit Basu
% Licensed under the GPL
function map = copper
basecolor = [184,115,51]/255.0; basecolor = basecolor/basecolor(1);
map = linspace(0,1,256)'*basecolor;
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