Replace NaNs with the number that appears to its left in the row.
Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
Determine the length of a string of characters
Find the area of a rectangle if length of the diagonal is given.
Create tangent function out of cosine only
Count me in
Get all prime factors
Create cosine function out of sine
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