This was cool, I didn't know about this before.
Replace NaNs with the number that appears to its left in the row.
Renaming a field in a structure array
Project Euler: Problem 2, Sum of even Fibonacci
Given a 4x4 matrix, swap the two middle columns
2 b | ~ 2 b
Back to basics 23 - Triangular matrix
Back to basics 22 - Rotate a matrix
Convert Roman to Arabic Numerals
Back to basics 1 - Saving
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