/usr/share/doc/ruby-gsl/examples/vector/set.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 | #!/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 Vector
v = GSL::Vector.alloc(1, 2, 3, 4, 5)
# Show third element
v[3]
# Set all elements to 9
v.set_all(9)
# Set all elements to 0
v.set_zero
# Set all elements to 3
v[] = 3
# Show v
v
# Set all elements to 0, except element 3 which is set to 1
v.set_basis(3)
# Set element 2 to 5.0
v.set(2, 5)
END
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