Return next combination

For example three-element combinations of 1:5

     1     2     3

     1     2     4

     1     2     5

     1     3     4

     1     3     5

     1     4     5

     2     3     4

     2     3     5

     2     4     5

     3     4     5

function should return

nextComb([1 3 5],5)
ans = [1 4 5] 

First input is the vector of which the next combination is searched. Second input is the scalar which indicates the length of the vector (1:n).