/usr/share/doc/ruby-gsl/examples/fresnel.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 | #!/usr/bin/env ruby
require("gsl")
# Abramovitz & Stegun
fc01 = 0.0999975
fs01 = 0.0005236
printf("fresnel_c(0.1):\n")
printf("Expect: %2.7f \t Calculated: %2.7f \n ", fc01, GSL::fresnel_c(0.1))
printf("fresnel_s(0.1):\n")
printf("Expect: %2.7f \t Calculated: %2.7f \n ", fs01, GSL::fresnel_s(0.1))
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