/usr/share/doc/ruby-gsl/examples/integration/qagp.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 17 18 19 20 | #!/usr/bin/env ruby
require 'gsl'
include GSL
include Math
f454 = Function.alloc{ |x|
x2 = x*x
x3 = x2*x
x3*log(((x2-1)*(x2-2)).abs)
}
exp_result = 5.274080611672716401E+01
exp_abserr = 1.755703848687062418E-04
pts = [0, 1, sqrt(2), 3]
result = f454.qagp(pts, 0.0, 1e-3)
p result
puts("exp_result: #{exp_result}")
puts("exp_abserr: #{exp_abserr}")
p Integration.qagp(f454, pts, [0.0, 1e-3])
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