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.
>> A = 1:5;
>> N = [-1 2 6];
>> values = giveup(A, N)
NaN 2 NaN
Is it just me or there are some new tricks I don't know? Cauz' in test 1, the variable A became comment syntax.
oh, i see, it seems some sort of brain-consumed skill involved...
Figurate number triangle
Getting logical indexes
Generate this matrix
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