This is a problem where there's probably a good built-in function, but I don't know it.
this will be hard to beat !
Replace NaNs with the number that appears to its left in the row.
Are you in or are you out?
Project Euler: Problem 8, Find largest product in a large string of numbers
Whether the input is vector?
Matrix indexing with two vectors of indices
Set a diagonal
Key Generation for Solitaire Cipher
Fair Scoring for Cody
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