def extend(self, trajectory):
        """
        Concatenate another trajectory

        Args:
            trajectory (Trajectory): Trajectory to add

        """
        if self.time_step != trajectory.time_step:
            raise ValueError('Trajectory not extended: Time steps of trajectories is incompatible')

        if len(self.species) != len(trajectory.species) and self.species != trajectory.species:
            raise ValueError('Trajectory not extended: species in trajectory do not match')

        self.to_positions()
        trajectory.to_positions()

        self.frac_coords = np.concatenate((self.frac_coords, trajectory.frac_coords), axis=0)
        self.lattice, self.constant_lattice = self._combine_attribute(self.lattice, trajectory.lattice,
                                                                      self.frac_coords.shape[0],
                                                                      trajectory.frac_coords.shape[0])
        self.site_properties = self._combine_attribute(self.site_properties, trajectory.site_properties,
                                                       self.frac_coords.shape[0], trajectory.frac_coords.shape[0])
def extend ( self , trajectory ) : if self . time_step != trajectory . time_step : raise ValueError ( 'Trajectory not extended: Time steps of trajectories is incompatible' ) if len ( self . species ) != len ( trajectory . species ) and self . species != trajectory . species : raise ValueError ( 'Trajectory not extended: species in trajectory do not match' ) self . to_positions ( ) trajectory . to_positions ( ) self . frac_coords = np . concatenate ( ( self . frac_coords , trajectory . frac_coords ) , axis = 0 ) self . lattice , self . constant_lattice = self . _combine_attribute ( self . lattice , trajectory . lattice , self . frac_coords . shape [ 0 ] , trajectory . frac_coords . shape [ 0 ] ) self . site_properties = self . _combine_attribute ( self . site_properties , trajectory . site_properties , self . frac_coords . shape [ 0 ] , trajectory . frac_coords . shape [ 0 ] )
Concatenate another trajectory

        Args:
            trajectory (Trajectory): Trajectory to add