MATLAB: How to solve a nested summation with recursive function

MATLABnested sumrecursiverecursive function

Hi,
I have a question related to solving a nested summation equation with a recursive function.
Suppose I have an equation of:
So, I tried to solve this problem by using a for loop to solve the summation equation and using a recursive function to expand the order of nested summation.
 test(3,0)
 function [sum] = test(a,b)
 sum = 0;
 for i=1:a-b
    if a-b == 1
        sum = 1;
    else
        sum = sum + (a-b) * test(a,b+i);
    end
 end
 end
From the code I got
 ans = 9
I appreciate any help, thanks.

Best Answer

I think your code is correct, and your calculation by hand is not.
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