def test_LDL():
A = DenseMatrix(3, 3, [4, 12, -16, 12, 37, -43, -16, -43, 98])
L, D = A.LDL()
assert L == DenseMatrix(3, 3, [1, 0, 0, 3, 1, 0, -4, 5, 1])
assert D == DenseMatrix(3, 3, [4, 0, 0, 0, 1, 0, 0, 0, 9])
def test_LDL():
A = DenseMatrix(3, 3, [4, 12, -16, 12, 37, -43, -16, -43, 98])
L, D = A.LDL()
assert L == DenseMatrix(3, 3, [1, 0, 0, 3, 1, 0, -4, 5, 1])
assert D == DenseMatrix(3, 3, [4, 0, 0, 0, 1, 0, 0, 0, 9])