/usr/share/doc/ruby-gsl/examples/complex/coerce.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 | #!/usr/bin/env ruby
require 'gsl'
a = GSL::Complex.rect(1, 2)
p 2 + a
p 2 - a
p 2*a
p a - 3
p a * 3
p 2.0/a # 0.4 - 0.8i
|