From: Daniel Moore <yahivin@...>
Date: 2009-06-13T01:56:11+09:00
Subject: [QUIZ] Matrix Rotator (#209)

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## Matrix Rotator (#209)

Здравствуйте Rubyists,

This week's quiz is write ruby method that will rotate a matrix 90
degrees counter-clockwise (or π/2 radians).

Ex:
    0 0 0 0
    0 X 0 0
    X X X 0
    0 0 0 0

    0 0 0 0
    0 0 X 0
    0 X X 0
    0 0 X 0

I have attached the following test suite for your convenience:

    require 'test/unit'
    require 'solution'

    class RotationTest < Test::Unit::TestCase
      def test_square_rotation
        square = [
          [0, 1, 0, 0],
          [0, 1, 1, 0],
          [0, 0, 1, 0],
          [0, 0, 0, 0]
        ]

        square_rotated = [
          [0, 0, 0, 0],
          [0, 1, 1, 0],
          [1, 1, 0, 0],
          [0, 0, 0, 0]
        ]

        assert_equal Matrix.rotate(square), square_rotated
      end

      def test_rectangular_rotation
        rectangle = [
          [0, 1, 0],
          [1, 1, 1]
        ]

        rectangle_rotated = [
          [0, 1],
          [1, 1],
          [0, 1]
        ]

        assert_equal Matrix.rotate(rectangle), rectangle_rotated
      end
    end

Have Fun!

-- 
-Daniel
http://rubyquiz.strd6.com

P. S. This may come in handy on a future quiz.

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