MATLAB Object-Oriented Programming

Initialize Object Arrays

In this section...

“Calls to Constructor” on page 10-5

“Initial Value of Object Properties” on page 10-6

Calls to Constructor

During the creation of object arrays, MATLAB can call the class constructor with no

arguments, even if the constructor does not build an object array. For example, suppose

that you define the following class:

classdef SimpleValue

properties

Value

end

methods

function obj = SimpleValue(v)

obj.Value = v;

end

end

end

Execute the following statement to create an array:

a(1,7) = SimpleValue(7)

Error using SimpleValue (line 7)

Not enough input arguments.

This error occurs because MATLAB calls the constructor with no arguments to initialize

elements 1 through 6 in the array.

Your class must support the no input argument constructor syntax. A simple solution is to

test nargin and let the case when nargin == 0 execute no code, but not error:

classdef SimpleValue

properties

Value

end

methods

function obj = SimpleValue(v)

Initialize Object Arrays