From now on, anytime I can chain together a composition of functions, I will never exceed a Cody score of 12! Thank you!
I also would encourage people not to submit this sort of dynamic expression regexp trick solutions indiscriminately. Having said that, and just for reference, you can push this down to a Cody score of 10... (hint1: use varargin; hint2: use 'command syntax' instead of 'function syntax').
To keep Cody from degenerating into a bunch of unreadable party tricks, we've blocked usage of eval, evalc, and a few others. But regexp is too important for us to block, so this trick will remain available into the foreseeable future. Which means, to back up Alfonso's comment, please don't abuse it. It's funny once, and then it just gets annoying.
Back to basics 21 - Matrix replicating
Switch matrix to a column vector
Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
Find out sum and carry of Binary adder
Find the nearest prime number
Return the 'Size' of a String of Code
Recurring Cycle Length (Inspired by Project Euler Problem 26)
Make an N-dimensional Multiplication Table
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
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