install gtools package firstly Aimin
At 12:17 PM 2/20/2007, Randy Zelick wrote: >gtools' ______________________________________________ R-help@stat.math.ethz.ch 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.