/usr/share/plplot_octave/red.m is in octave-plplot 5.10.0+dfsg-1.
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 | ## Copyright (C) 1999 Paul Kienzle
##
## This program is free software and may be used for any purpose. This
## copyright notice must be maintained. Paul Kienzle is not responsible
## for the consequences of using this software.
## Colormap:
##
## map = red (number)
## Author: Paul Kienzle <pkienzle@cs.indiana.edu>
## Created: Sept 99
## modified: jc
function map = red (number)
if (nargin == 0)
number = 64;
elseif (nargin > 1)
usage ("red (number)");
endif
gr = [0:(number-1)]';
map = [ gr, zeros(number,1), zeros(number,1) ] / (number - 1);
endfunction
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