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require File.expand_path('../../../spec_helper', __FILE__)
require 'matrix'
describe "Matrix.orthogonal?" do
it "returns false for non orthogonal matrices" do
Matrix[[0, 1], [1, 2]].orthogonal?.should == false
Matrix[[1, 1, 0], [0, 1, 1], [1, 0, 1]].orthogonal?.should == false
end
it "returns true for orthogonal matrices" do
Matrix[[0, 1], [1, 0]].orthogonal?.should == true
end
it "raises an error for rectangular matrices" do
[
Matrix[[0], [0]],
Matrix[[0, 0]],
Matrix.empty(0, 2),
Matrix.empty(2, 0),
].each do |rectangular_matrix|
lambda {
rectangular_matrix.orthogonal?
}.should raise_error(Matrix::ErrDimensionMismatch)
end
end
end
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