/usr/share/doc/ruby-gsl/examples/vector/mul.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 | #!/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 test Vectors
a = GSL::Vector.alloc(1, 2, 3, 4, 5)
b = GSL::Vector.alloc(6, 7, 8, 9, 10)
# Show element-wise multiplication
a * b
# Show that *= is not an in-place operation
# (it sets receiver to new object).
a.object_id
a *= b
a.object_id
# Show that #mul! is a true in-place operation
# (object_id does not change).
a.object_id
a.mul!(b)
a.object_id
# Same as "a = a / b" (element-wise division)
a /= b
# Show multiply by constant
a * 2
# Show coersion
2 * a
# Show coersion
5 / a
# Show that Vector * Vector::Col produces dot product
a * b.trans
a.dot(b)
# Show that Vector::Col * Vector produces Matrix
a.trans * b
END
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