"cat" is a really nice touch for concatenation of those arrays! your solutions never fail my expectation.
by the way, i saw that "sub-func" comment...:)
Calling the two sub-functions the right way will not hurt your score. Great work though. :)
Back to basics 23 - Triangular matrix
Find the largest value in the 3D matrix
Reindex a vector
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Find the average of a random sequance
Triangle of numbers
Horizontal matrix sort
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