/usr/share/doc/ruby-gsl/examples/matrix/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 36 37 38 39 40 41 | #!/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 3x3 matrix
m = GSL::Matrix.alloc([1, 2, 3, 4, 5, 6, 7, 8, 9], 3, 3)
# Create a 3x4 matrix
m = GSL::Matrix.indgen(3, 4)
# Set element at row 1, column 2 to 99.9
m[1,2] = 99.9
# Show matrix
m
# Set all elements to 5 using #set_all
m.set_all(5)
# Set all elements to 4.3 using #set
m.set(4.3)
# Set all elements to 2 using #[]
m[] = 2
# Show matrix
m
# Set all elements to 0
m.set_zero
# Set matrix to identity matrix
m.set_identity
END
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