/usr/share/doc/ruby-gsl/examples/vector/complex.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 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | #!/usr/bin/env ruby
# Turn on warnings
$-w = true
require 'irb/xmp'
require 'gsl'
# Apparently, IRB::Frame has a bug that prevents the defaults from working, so
# an XMP instance must be created explicitly this way instead of using the
# otherwise convenient xmp method.
XMP.new(IRB::Frame.top(-1)).puts <<END
# Create a Vector::Complex of 5 elements, all 0+0i
v = GSL::Vector::Complex.alloc(5)
# Set element 2 to 3+4i
v[2] = [3, 4]
# Show vector
v
# Show element 2
v[2]
# Use #map! to modify each element of vector in-place
i = 0
v.map! do |elm|
i += 1
elm += i
end
# Show vector
v
# Show element 3
v[3]
# Set all elements to 2+4.7i
v.set_all([2, 4.7])
# Create subvector starting at element 1 and spanning 3 elements
v2 = v.subvector(1, 3)
# Show size of subvector
v2.size
# Get a Vector::View of the real components of Vector::Complex v
p v.real
# Convert v to an Array
v.to_a
END
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