/usr/share/doc/ruby-gsl/examples/matrix/colvectors.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 | #!/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 two 3x3 matrices
m = GSL::Matrix.alloc(1..9, 3, 3)
n = GSL::Matrix.alloc(11..19, 3, 3)
# Get Vector::Col::View for column 1 of Matrix a
a = m.col(1)
# Get Vector::Col::View for column 2 of Matrix b
b = n.col(2)
# Create new Matrix from Vector::Col::Views
c = GSL::Matrix[a, b]
END
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