def test_der_1(): x = np.arange(15); yield (npt.assert_array_almost_equal, list_derivative(x**2,x,1), 2*x)
def test_der_2(): x = np.arange(15); yield (npt.assert_array_almost_equal, list_derivative(x**2,x,2), 2*np.ones(x.shape) )