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.
Flip the main diagonal of a matrix
construct matrix with identical rows
Matlab Basics - Switching Assignments
Rotate a matrix for 180 degree
find a specific element from an matrix
Determine whether the input is divisible by 3 as well as 5
multiply an array by its position number
Find remainder when x is divided by 3
Find the last digit
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