/usr/share/doc/ruby-gsl/examples/matrix/write.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 | #!/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 test Matrix
m = GSL::Matrix.alloc([1, 2], [3, 4])
# Write Matrix in binary format to file a.dat
m.fwrite("a.dat")
# Create another test Matrix
m2 = GSL::Matrix.alloc([5, 6], [7, 8])
# Write Matrix in text format to file b.dat
m2.fprintf("b.dat")
END
|