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require_relative '../../spec_helper'
require 'matrix'
describe "Matrix.unitary?" do
it "returns false for non unitary matrices" do
Matrix[[0, 1], [1, 2]].unitary?.should == false
Matrix[[0, Complex(0, 2)], [Complex(0, 2), 0]].unitary?.should == false
Matrix[[1, 1, 0], [0, 1, 1], [1, 0, 1]].unitary?.should == false
end
it "returns true for unitary matrices" do
Matrix[[0, Complex(0, 1)], [Complex(0, 1), 0]].unitary?.should == true
end
version_is((Matrix::const_defined?(:VERSION) ? Matrix::VERSION : "0.1.0"), "0.3.0") do
it "returns true for unitary matrices with a Complex and a negative #imag" do
Matrix[[0, Complex(0, 1)], [Complex(0, -1), 0]].unitary?.should == true
end
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|
-> {
rectangular_matrix.unitary?
}.should raise_error(Matrix::ErrDimensionMismatch)
end
end
end
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