/usr/share/doc/ruby-gsl/examples/matrix/rowcol.rb is in ruby-gsl 2.1.0.3+dfsg1-1build1.
This file is owned by root:root, with mode 0o644.
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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 | #!/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 3x3 test Matrix a
a = GSL::Matrix.alloc([1, 2, 3, 4, 5, 6, 7, 8, 9], 3, 3)
# Create Vector initialized from row 0 of Matrix a
b = a.get_row(0)
# Create Vector::Col for column 2 of Matrix a
c = a.get_col(2)
# Set column 2 of Matrix a from Vector from row 0
a.set_col(2, b)
# Set row 0 of Matrix a from Vector::Col from column 2
a.set_row(0, c)
# Create new Matrix from a with rows 1 and 2 swapped
a.swap_rows(1, 2)
# Show that Matrix a remains unmodified
a
# Swap columns 1 and 2 of Matrix a in-place
a.swap_cols!(1, 2)
# Show that Matrix a is modified
a
# Create new Matrix that is transpose of Matrix a
atrans = a.transpose
# Transpose Matrix a in-place
a.transpose!
# Transpose Matrix a in-place again
a.transpose!
END
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