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! :)
Angle between Two Vectors
Generate a NaN...on purpose
Words Count: A Cell Array Approach
Fast 1-D Convolution (valid shape)
Fast 1-D Convolution (full shape)
String Array Basics, Part 2: Convert String Array to Cell Array; No Missing Values
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