On 06-06-2013, at 17:04, David Carlson <dcarlson at tamu.edu> wrote: > You didn't give us data, but this may give you enough to solve your problem: > >> set.seed(42) >> nrows <- 6 >> ncols <- 5 >> mat1 <- matrix(sample.int(100, 30), nrows, ncols) >> mat1 > ….. >> newmat <- matrix(rbind(as.vector(mat1), as.vector(mat2)), nrows*2, ncols) Nice. Berend