At a minimum, you should make this problem variable. For example, find the element at the ith row and jth column and define i and j in the test cases, which are passed along with the function.
Back and Forth Rows
Duplicate each element of a vector.
Create a vector whose elements depend on the previous element
convert matrix to single column
find the mean of all elements in a matrix
first element of matrix
modulus of a number
multiply an array by its position number
Find the last digit
Determine whether the input is divisible by 3 as well as 5
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