'Vector norm.
The norm is the standard Frobenius norm, i.e., the square root of the
sum of the squares of all components with non-angular units, which is
always unity for vectors on the unit sphere.
Returns
norm : `~astropy.units.Quantity`
Dimensionless ones, with the same shape as the representation.'

def norm(self):

    return u.Quantity(np.ones(self.shape), u.dimensionless_unscaled, copy=False)
