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.
Set some matrix elements to zero
Return 'on' or 'off'
construct matrix with identical rows
Is it column vector?
find the mean of all elements in a matrix
first element of matrix
modulus of a number
Find remainder when x is divided by 3
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