Resets the system into the last known state as given by the input
           values

def reset(self, populations, lag, mu, u_int, j_coup, mean_f):
        """Resets the system into the last known state as given by the input
           values"""

        self.set_filling(populations)
        self.param['lambda'] = lag
        self.param['orbital_e'] = mu
        self.selfconsistency(u_int, j_coup, mean_f)