def test_cos_deriv_y(): x = AutoDiff(4, "x") y = AutoDiff(5, "y") f = ef.cos(x * y) assert np.isclose(f.der['y'], -3.6517810029105107)
def test_cos_val(): x = AutoDiff(4, "x") y = AutoDiff(5, "y") f = ef.cos(x * y) assert np.isclose(f.val, 0.40808206181339196)
def test_cos_deriv_x(): x = AutoDiff(4, "x") y = AutoDiff(5, "y") f = ef.cos(x * y) assert np.isclose(f.der['x'], -4.564726253638138)
def test_cos_illegal_arg(): with pytest.raises(AttributeError): assert ef.cos("thirty")
def test_cos_numeric_value(): assert np.isclose(ef.cos(4), np.cos(4))
def test_cos_numeric_input_no_deriv(): with pytest.raises(AttributeError): assert ef.cos(4).der
def test_cos_no_sec_derivative_xy(): x = AutoDiff(4, "x") y = AutoDiff(5, "y") with pytest.raises(AttributeError): assert ef.cos(x).der2['x']
def test_cos_deriv2_xy(): x = AutoDiff(4, "x", H=True) y = AutoDiff(5, "y", H=True) f = ef.cos(x * y) assert np.isclose(f.der2['xy'], -9.074586486995466)
def test_cos_deriv2_y(): x = AutoDiff(4, "x", H=True) y = AutoDiff(5, "y", H=True) f = ef.cos(x * y) assert np.isclose(f.der2['y'], -6.529312989014271)
def test_cos_deriv2_x(): x = AutoDiff(4, "x", H=True) y = AutoDiff(5, "y", H=True) f = ef.cos(x * y) assert np.isclose(f.der2['x'], -10.202051545334799)