find the first elements of a column matrix
This would be better as "find the nth element of an array." Also, a column matrix doesn't exist. Perhaps you meant column vector, though the variables in your test cases are row vectors.
Replace NaNs with the number that appears to its left in the row.
Duplicate each element of a vector.
06 - Matrix Equations 2
07 - Common functions and indexing 1
Determine the mean of matrix
find the mean of all elements in a matrix
modulus of a number
Find remainder when x is divided by 3
Find the last digit
Determine whether the input is divisible by 3 as well as 5
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