def qdd_full(self, t):
     from interpolation import active_to_full
     return active_to_full(self.qdd(t), self.dof_zeros, self.active_dofs)
 def q_full(self, t):
     from interpolation import active_to_full
     return active_to_full(self.q(t), self.q_ref, self.active_dofs)