#!/usr/bin/env ruby
require("gsl")

a = Matrix.alloc([1, 2, 3, 4, 5, 6, 7, 8, 9], 3, 3)
b = Matrix.alloc([6, 7, 8], [2, 3, 4], [3, 4, 5])

p a + b

a += b
p a

a -= b
p a

p a + 2

p 2 + a

a += 2
p a

a -= 2
p a