def _init_state(self):
    mixed = self._mixed
    Q = mixed.get_total_flow('m3/d')
    if (self._concs is not None):
        Cs = self._concs
    else:
        Cs = mixed.conc
    self._state = np.append(Cs, Q).astype('float64')
    self._dstate = (self._state * 0.0)
def _init_state(self):
    mixed = self._mixed
    Q = mixed.get_total_flow('m3/d')
    if (self._concs is not None):
        Cs = self._concs
    else:
        Cs = mixed.conc
    self._state = np.append(Cs, Q).astype('float64')
    self._dstate = (self._state * 0.0)