def test_minor_3x3(self):
a = Matrix([
[3, 5, 0],
[2, -1, -7],
[6, -1, 5]
])
b = a.submatrix(1, 0)
self.assertEqual(b.determinant(), 25)
self.assertEqual(a.minor(1, 0), 25)
def test_submatrix_3x3(self):
a = Matrix([
[1, 5, 0],
[-3, 2, 7],
[0, 6, -3]
])
self.assertEqual(
a.submatrix(0, 2),
Matrix([
[-3, 2],
[0, 6]]
)
)
def test_submarix_4x4(self):
a = Matrix([
[-6, 1, 1, 6],
[-8, 5, 8, 6],
[-1, 0, 8, 2],
[-7, 1, -1, 1]
])
self.assertEqual(
a.submatrix(2, 1),
Matrix([
[-6, 1, 6],
[-8, 8, 6],
[-7, -1, 1]
]))