/usr/share/doc/ruby-gsl/examples/cdf.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 | #!/usr/bin/env ruby
require("gsl")
x = 2.0
P = GSL::Cdf::ugaussian_P(x);
printf("prob(x < %f) = %f\n", x, P);
Q = GSL::Cdf::ugaussian_Q(x);
printf("prob(x > %f) = %f\n", x, Q);
x = GSL::Cdf::ugaussian_Pinv(P);
printf("Pinv(%f) = %f\n", P, x);
x = GSL::Cdf::ugaussian_Qinv(Q);
printf("Qinv(%f) = %f\n", Q, x);
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