Thanks. But I after I restarted R, it is still the old version of the package that is loaded. Am I using the update.packages() correctly? Regards, Wayne (Yanwei) Zhang
______________________________________________ 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.