how to acces vector matlab code example

Example 1: get elements of array matlab

Indicating indexes between ([]) retrieves corresponding values in Matlab. 
array_borders=array([1: end])
As end defines size of the array, retrieve first and last border values of array

Example 2: matlab matrix indexing

v = [16 5 9 4 2 11 7 14];
v(3)     % Extract the third element  (ans = 9)