I have already follow your step, it still not work when I merge groupA and groupB , the error message was shown Error in rbind(deparse.level, ...) : replacement has length zero
-- View this message in context: http://r.789695.n4.nabble.com/Insert-row-in-specific-location-between-data-frames-tp4634905p4635153.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.