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! :)
Reverse Run-Length Encoder
Largest Twin Primes
Make a logical diamond using GALLERY function
How many digits are there?
Toeplitize a matrix
String Array Basics, Part 3: Convert Cell Array with Missing Values to String Array
Fast 1-D Convolution (same shape)
Integer complexity (Large numbers)
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