arrays - Manipulating a struct which is a class property in MATLAB -

i've been trying work matlab classes & structs in order develop traffic simulation. have not worked actively matlab classes before, gets bit tricky @ times. questions involves manipulating struct, property of class.

top-level access

vehicles_handle = vehicleshandle; vehicles_handle.createvehicles(initialtrafficdensity); vehicles_handle.vehicles(1) 

class definition

classdef vehicleshandle     %vehicleshandle summary of class goes here     %   detailed explanation goes here      properties          active_vehicles_count         vehicles     end      methods (access = public)         function obj = vehicleshandle             obj.active_vehicles_count = 0;             obj.vehicles = struct('lane',0,'position',0,'velocity',0);          end         function obj = createvehicles(obj,initialtrafficdensity)             obj.active_vehicles_count = obj.active_vehicles_count + 1;             obj.vehicles(1).lane = 1;             obj.vehicles(1).position = 3;             obj.vehicles(1).velocity = 3;             obj.vehicles(2).lane = 2;             obj.vehicles(2).position = 3;             obj.vehicles(2).velocity = 3;         end 

now, can't see output expected (which vehicles_handle.vehicles(1)), see them properties of vehicle 1 0's. situation changes, of course, when put in function vehicleshandle, want handle creation of vehicles way.

i know code might not efficient way handle this, want learn handling struct in class without pain. constructive comments , in advance.

getting rid of problem quite easy:

classdef vehicleshandle 

has

classdef vehicleshandle < handle 

and understand why, please read comparison of handle , value classes.