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require 'matrix'
a = Matrix[
[3.0, 9.0, 7.0, 5.0, 1.0, 1.0, 0.0, 8.0],
[6.0, 7.0, 0.0, 9.0, 8.0, 2.0, 1.0, 1.0],
[3.0, 5.0, 4.0, 2.0, 6.0, 1.0, 2.0, 3.0],
[4.0, 7.0, 1.0, 5.0, 5.0, 0.0, 6.0, 1.0],
[0.0, 9.0, 9.0, 8.0, 3.0, 0.0, 6.0, 4.0],
[1.0, 4.0, 0.0, 9.0, 2.0, 6.0, 3.0, 5.0],
[5.0, 1.0, 9.0, 7.0, 9.0, 8.0, 5.0, 9.0],
[0.0, 1.0, 0.0, 3.0, 3.0, 2.0, 8.0, 3.0],
]
puts a**2
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