Problem with double sums

how to write this function in MATLAB knowing that if I separate the two sums as I wrote one tends to infinity.

The first idea I wrote

then check my code in some values ​​of f as an example but the result is because

[Walter Roberson]

Actual code, please.

[B.E.]

Thank you so much Walter, I have resolved.

I swapped the sum

Answer 1

[B.E.]

https://fr.mathworks.com/matlabcentral/answers/497684-problem-with-double-sums#comment_780161