Hello, Did you find a solution to this problem in the R mailing list ? I am having the same problem but there were apparently no replies to your question or didnt find them ?
Thanks Anusha [[alternative HTML version deleted]] ______________________________________________ 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.