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From: Matthew on 25 Jul 2010 02:32
Hi. I've made a class. For simplicity, we'll call it A. I want to create a class B, such that it contains an array of A objects. I also won't know how many A objects to create when I initialize B, so I'll have to dynamically allocate memory for the A objects. However, in MATLAB it seems I cannot do this...

classdef A
properties
A1
A2
end
methods
function A_object = A(test)
end
end

classdef B
properties
Array_of_A
num_elements
end
methods
function B_object = B(test)
num_elements=0;
end
function num = AddAObject(B_Object,A_Object)
num_elements=num_elements+1;
B_Object.Array_of_A(num_elements)=A_Object;
end
end


Thanks for your help,
Matt
From: Matt J on 25 Jul 2010 10:35

It seems excessive to create a function AddAObject to do this. In default MATLAB behavior, you can just do

B_Object.Array_of_A(end)=A_Object;

which is about the most keystroke-efficient thing you can do if B is not a handle class.

But, if you insist, the following will fix your existing code:

classdef B
properties
Array_of_A
num_elements
end
methods
function B_object = B(test)
B_object.num_elements=0;
end
function B_Object = AddAObject(B_Object,A_Object)
B_Object.num_elements=B_object.num_elements+1;
B_Object.Array_of_A(num_elements)=A_Object;
end
end
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