Wrap index to select element in vector

Wrap index to select element in vector

This simple function does a circular selection (wrap the index) to select one element in a vector [1xN] or [Nx1]. It's work for negative values also.

Exemple:
A = (1:10)'

A =

1
2
3
4
5
6
7
8
9
10

wrapindex(A,12) = 2
wrapindex(A,-2) = 9