Back to basics 25 - Valid variable names
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Create a two dimensional zero matrix
Max of a Vector
Replace NaNs with the number that appears to its left in the row.
Find the numeric mean of the prime numbers in a matrix.
Remove any row in which a NaN appears
Most nonzero elements in row
Prime factor digits
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