Matlab Object Oriented Programming: Setting and getting properties for multiple objects

Question

I have a class like so:

classdef Vehicle < handle
    %Vehicle
    %   Vehicle superclass

    properties
        Is_Active  % Does the vehicle exist in the simualtion world?
        Speed      % [Km/Hour]
    end

    methods
        function this = Vehicle(varargin)
            this.Speed = varargin{1}; % The speed of the car
            this.Is_Active = true;
        end
    end
end

I create my Vehicle-class objects in a cell form (don't ask me why - it's a laymen's workaround for global setting):

Vehicles{1} = Vehicle(100);
Vehicles{2} = Vehicle(200);
Vehicles{3} = Vehicle(50);
Vehicles{1}.Is_Active = true;
Vehicles{2}.Is_Active = true;
Vehicles{3}.Is_Active = true;

My questions: 1. Is there a way to set all three objects' active in a single command? 2. Is there a way to get all three objects' Speed in a single command? 3. Is there a way to query which vehicles are faster than X in a single command?

Thanks Gabriel

aguadopd · Accepted Answer · 2016-06-07 14:38:14Z

8

For the members of the same class you can use round brackets (regular array):

Vehicles(1) = Vehicle(100);
Vehicles(2) = Vehicle(200);
Vehicles(3) = Vehicle(50);

To set all objects use deal:

[Vehicles(:).Is_Active] = deal( true );

You could also initialize an array of objects in the first place.

For your questions (2) and (3) the syntax is equivalent to those of MATLAB structures:

speedArray = [Vehicles.Speed];
fasterThanX = Vehicles( speedArray > X );

Such vectorization notation is a strong point of MATLAB and is used extensively.

edited Jun 7, 2016 at 14:38

aguadopd

6019 silver badges17 bronze badges

answered Apr 24, 2011 at 17:16

Mikhail Poda

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