3-02-2012, 11:26 (+0000); Schumacher, G. escriu: > I have a matrix of 17 rows and 20 columns. I want to replicate this > matrix 20 times, but I only want to replicate the rows. How do I do > that? If x is your matrix, this x[rep(1:17, 20),] will give you a matrix with 340 rows and 20 columns which I think is what you want. Cheers, Ernest