Enumeration of combinations
C = combnk(v,k)
C = combnk(v,k) produces a matrix C with k columns and n!/k!(n–k)! rows, where each row contains k of the elements in the vector v.
It is not practical to use this function if v has more than about 15 elements.
Combinations of characters from a string.
C = combnk('tendril',4); last5 = C(31:35,:) last5 = tedr tenl teni tenr tend
Combinations of elements from a numeric vector.
c = combnk(1:4,2) c = 3 4 2 4 2 3 1 4 1 3 1 2