A dummy way is to resequence or rematrix olddata <- data.frame(matrix(rnorm(200), nrow=40)) newdata <- data.frame(matrix(as.vector(t(olddata)), nrow=nrow(olddata)/10)) dim(olddata) dim(newdata) ----- A R learner. -- View this message in context: http://r.789695.n4.nabble.com/Concatenation-tp2225569p2226200.html Sent from the R help mailing list archive at Nabble.com.