/usr/share/doc/ruby-gsl/examples/random/randomwalk2d.rb is in ruby-gsl 2.1.0.3+dfsg1-1build1.
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 | #!/usr/bin/env ruby
require("gsl")
N = 1000
GSL::Rng.env_setup()
T = GSL::Rng::DEFAULT
r = GSL::Rng.alloc(T)
x = 0.0
y = 0.0
printf("%g %g\n", x, y);
N.times do
dx, dy = r.dir_2d()
x += dx
y += dy
printf("%g %g\n", x, y);
end
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