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require File.expand_path('../../../spec_helper', __FILE__)
require 'matrix'
describe "Matrix#[]" do
before :all do
@m = Matrix[[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10, 11]]
end
it "returns element at (i, j)" do
(0..3).each do |i|
(0..2).each do |j|
@m[i, j].should == (i * 3) + j
end
end
end
it "returns nil for an invalid index pair" do
@m[8,1].should be_nil
@m[1,8].should be_nil
end
end
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