MathPHP\LinearAlgebra\MatrixTest::dataProviderForGetDiagonalElements PHP Method

    public function dataProviderForGetDiagonalElements()
    {
        return [[[[1, 2]], []], [[[1], [2]], []], [[[1]], [1]], [[[1, 2], [2, 3]], [1, 3]], [[[1, 2, 3], [2, 3, 4], [3, 4, 5]], [1, 3, 5]]];
    }