Hi Kang,As well as Benjamin's solution, Rolf kindly contributed the function to the plotrix package, where is it known as "revaxis".
Jim ______________________________________________ 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.
