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Is it possible define more than one class constructor in Matlab? If yes, how?
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Each class has only one constructor, and each . m-file can only contain one class definition. If you want to have a class with slight differences depending on input, you can use properties that define switches that are recognized by the class methods.
A class can have multiple constructors that assign the fields in different ways. Sometimes it's beneficial to specify every aspect of an object's data by assigning parameters to the fields, but other times it might be appropriate to define only one or a few.
Purpose of Class Constructor Methods A constructor method is a special function that creates an instance of the class. Typically, constructor methods accept input arguments to assign the data stored in properties and return an initialized object. For a basic example, see Creating a Simple Class.
To call the constructor for each superclass within the subclass constructor, use the following syntax: obj@SuperClass1(args,...);
Each class has one constructor. However ... the constructor can accept any number and type of arguments, including those based on varargin.
So, to provide the option of a default third argument in Java you could write something like this (examples based on java documentation):
public Bicycle(int startCadence, int startSpeed, int startGear) { gear = startGear; cadence = startCadence; speed = startSpeed; } public Bicycle(int startCadence, int startSpeed) { gear = 1; cadence = startCadence; speed = startSpeed; } In Matlab you could write
classdef Bicycle < handle properties (Access=public) gear cadence speed end methods (Access = public) function self = Bicycle(varargin) if nargin>2 self.gear = varargin{3}; else self.gear = 1; end self.cadence = varargin{1}; self.speed = varargin{2}; end end end If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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