Hi everyone, can someone help me with this double sum ?
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John D'Errico on 7 Oct 2022
Edited: John D'Errico on 7 Oct 2022
Surely you can use a loop? Actually just nested loops? Perhaps your problem is MATLAB does not allow a zero index, yet you have what would seem to be a zero index.
Next, are those powers of S and T?
Anyway, all you need to do is
ThisSum = 0;
for j = 0:4
for i = 0:4-j
ThisSum = ThisSum + a(i+1,j+1)*T^i*S^j;
I assume that a is an array, since you have what apear to be indices. And a would need to be a 5x5 array.
Are there other ways to solve this? Well, yes. Do you need them? NO.