It seems easy, but...
You cannot use +, -, plus, diff, cumsum, *, prod, times, etc.
conv([x y],[1 1],'valid') will not work as it contains STRINGS !!
Very witty solution.
Back to basics 9 - Indexed References
Arrange vector in ascending order
Set the array elements whose value is 13 to 0
convert matrix to single column
Sum the 'edge' values of a matrix
Compound interest - number e
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