Thanks a lot, Jim. Do you mind to post out the complete content of your R script suggested?
I got add in your R code in my existing R script. It shown the following error message: Error in rbind(br[, 2] + 1, br[, 4]) : object 'br' not found Thanks for your further reply. -- View this message in context: http://r.789695.n4.nabble.com/Help-with-plot-Grouped-Bar-Plot-by-using-R-tp4448762p4449016.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.