/usr/share/doc/ruby-gsl/examples/sf/bessel_IK.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 9 10 11 12 | #!/usr/bin/env ruby
require("gsl")
n = 100
x = GSL::Vector.linspace(0.01, 4, n)
I0 = GSL::Sf::bessel_I0(x)
I1 = GSL::Sf::bessel_I1(x)
I2 = GSL::Sf::bessel_In(2, x)
y0 = GSL::Sf::bessel_K0(x)
y1 = GSL::Sf::bessel_K1(x)
y2 = GSL::Sf::bessel_Kn(2, x)
GSL::Vector.graph(x, I0, I1, I2, y0, y1, y2, "-T X -C -g 3 -y 0 6 -X x -L 'Bessel functions I0, I1, I2, K0, K1, K2'")
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