/usr/share/doc/ruby-gsl/examples/sf/expint.rb is in ruby-gsl 2.1.0.3+dfsg1-1build1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 | #!/usr/bin/env ruby
require("gsl")
n = 100
x = GSL::Vector.linspace(0.01, 2, n)
y1 = GSL::Sf::expint_E1(x)
y2 = GSL::Sf::expint_E2(x)
yi = GSL::Sf::expint_Ei(x)
GSL::Vector.graph(x, y1, y2, yi, "-T X -C -g 3 -X x -Y 'E(x)' --toggle-rotate-y-label -L 'Exponential integral E1, E2, Ei'")
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