code: def rs(self):
          
          rs = np.linalg.norm(self.coords_for_computations, axis=1)
          return ComputedColumn(self, rs)
docs: Return the radius of each element (either vertices or centers
          depending on the setting in the mesh) with respect to the center of
          the star.
  
          NOTE: unscaled
  
          (ComputedColumn)