Problem 3108. Don't Try, give up and return NaN.
This is another version of problem 3107.
The goal is to return values of an array A given index N, but return NaN for incorrect index.
Example:
    >> A = 1:5;
    >> N = [-1 2 6];
    >> values = giveup(A, N)
    values =
       NaN     2     NaN
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