def test_multi_dim_4():
x = AD(1, 1, 'x')
y = AD(2, 2, 'y')
z = AD([y.cos() + x.cos(), y.tan() + x.tanh()])
z.sort(['x', 'y'])
np.testing.assert_allclose(z.val,
np.array([0.12415547,
-1.42344571]).reshape(2, 1),
atol=1e-5)
np.testing.assert_allclose(z.der,
np.array([[-0.84147098, -1.81859485],
[0.41997434, 11.54879841]]),
atol=1e-5)
assert z.name == ['x', 'y']
def test_tan_inf():
x = AD(np.pi / 2, 1, 'x')
with pytest.raises(ValueError):
x.tan()
def test_tan():
x = AD(0.5, 1, 'x')
z = x.tan()
assert z.val == [np.tan(0.5)]
assert z.der == [1 / (np.cos(0.5))**2]