/usr/share/doc/ruby-gsl/examples/complex/add.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 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | #!/usr/bin/env ruby
require 'gsl'
a = GSL::Complex.rect(1, 2)
b = GSL::Complex[3, 4]
p a + b
p a
a += b
p a
p a - b
p a
a -= b
p a
p a + b + a
p a.add(b)
p a
p a.sub(b)
p a
p a + 5
p a.add_real(5)
p a
p a.sub_real(5)
p a
p a.add_real(6).sub_real(6)
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