MATLAB: How to assign value in multidimensional variable

Question

I was trying to assign value in a multidimensional variable. My first code is wroking Here it is:

 prod = 1; ch = 1; 
 AAA(prod,ch,:) =  A;

This code gives me this output in worksapce

But My 2nd code where I just increase the number of dimension. It gives me error. Here is the code:

prod = 1; ch = 1;sub = 1;
AAA(sub,prod,ch,:) =  A;

This gives me error like this:

Answer 1

It will only give error if AAA is already defined. Try the following code

clear AAA
prod = 1; ch = 1;sub = 1;
AAA(sub,prod,ch,:) =  A;