Date: Nov 26, 2012 11:12 PM Author: Jerry Subject: nchoosek all pairwise combinations Hello,

There is a vector

A=['a', 'b', 'c', 'd','e']

I would like to make a square matrix of all paiwise interactions of this vector:

a b c d e

a aa ba ca da ea

b ab bb cb db eb

c ac bc cc dc ec

d ad bd cd dd ed

e ae bd ce de ee

However, nchoosek allow me to create only half of this matrix. Is there any function to make all these possible interactions within "A"?

Thanks,

Jerry