Sorry, I made a mistake. Should add "byrow = TRUE". Using randomly created values can't check the result, a sequence will be better.
olddata <- data.frame(matrix(1:200, nrow=40, byrow = TRUE)) newdata <- data.frame(matrix(as.vector(t(olddata)), nrow=nrow(olddata)/10,byrow = TRUE)) dim(olddata) dim(newdata) olddata[1:2,] newdata[1:2,] ----- A R learner. -- View this message in context: http://r.789695.n4.nabble.com/Concatenation-tp2225569p2226259.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.