/usr/share/doc/ruby-gsl/examples/random/poisson.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 | #!/usr/bin/env ruby
require("gsl")
N = 10000
r = GSL::Rng.alloc
v = r.poisson(5, N)
h = v.histogram(20, 0, 20)
h.graph
|