CODEWITHSUNDEEP
arraysmatlabclassobjectstruct
mozcelikors
mozcelikors

Reputation: 2744

Manipulating a struct which is a class property in MATLAB

I've been trying to work with MATLAB classes & structs in order to develop a traffic simulation. I have not worked actively with MATLAB classes before, so it gets a bit tricky at times. This questions involves manipulating a struct, which is a property of a class.

Top-level access

vehicles_handle = VehiclesHandle;
vehicles_handle.CreateVehicles(InitialTrafficDensity);
vehicles_handle.vehicles(1)

Class definition

classdef VehiclesHandle
    %VEHICLESHANDLE Summary of this 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, I can't see the output as expected (which is vehicles_handle.vehicles(1)), I see them the properties of the vehicle 1 as 0's. The situation changes, of course, when I put then in the function VehiclesHandle, but I want to handle creation of vehicles this way.

I know that the code might not be the most efficient way to handle this, but I really do want to learn about handling a struct in this class without pain. Thanks for all the constructive comments and help in advance.

Upvotes: 0

Views: 106

Answers (1)

Finn
Finn

Reputation: 2343

Getting rid of the problem is quite easy:

classdef VehiclesHandle

has to be 

classdef VehiclesHandle < handle

And to understand why, please read Comparison of Handle and Value Classes.

Upvotes: 1

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