Thanks for the fun problem!
So compact! I didn't know about arrayfun and cellfun. Very useful functions.
Took a couple of tries, but I got it! :)
Renaming a field in a structure array
Make a random, non-repeating vector.
Generate a NaN...on purpose
Sum My Indices
Integer complexity (Large numbers)
The Top 5 Primes
Apply Function to Each Field of a Structure Array: Part 1
Spot the First Occurrence of 5
0, 2, 0, -2, 0, 2, 0, -2, ...
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