/usr/share/plplot_octave/hsv.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 28 29 30 | ## 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 = hsv (number)
## Author: Paul Kienzle <pkienzle@cs.indiana.edu>
## Created: Sept 99
## Modified: jc
function map = hsv (number)
if (nargin == 0)
number = 64;
elseif (nargin > 1)
usage ("hsv (number)");
endif
x = [0:(number-1)]'/number;
r = clip(6*abs(x-1/2) - 1);
g = clip(2 - 6*abs(x-1/3));
b = clip(2 - 6*abs(x-2/3));
map = [r, g, b];
endfunction
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