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.
Remove any row in which a NaN appears
Back to basics 4 - Search Path
Back to basics 7 - Equal NaNs
Speed of car
multiply an array by its position number
find the mean of all elements in a matrix
Find the last digit
Find remainder when x is divided by 3
modulus of a number
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