/usr/share/doc/ruby-gsl/examples/function/sin.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 | #!/usr/bin/env ruby
require("gsl")
x = GSL::Vector.linspace(0, 2*Math::PI, 20)
f = GSL::Function.alloc { |x|
GSL::Sf::sin(x)
}
f.graph(x, "-T X -g 3 -C -L 'sin(x)'")
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