Description 
[B P]=numunique(A) for the array A returns the same values as in A but
with no repetitions. B will also be sorted. A can only be numerical,
as the name of the function suggests.
The second output, P, is a row of cells, containing the indices of A,
such that, A(p{n})=B(n) is true. P has the same number of cells as the
number of elements in B.
Note that each cell of P lists all the indices of A, not only the first
or last occurrence, which have the repetitious values. This is different to the Mathwork's
function UNIQUE. Sometimes we need to know all the indices of which A have the same values.
