Hello all, I have to learning R from beginning, since my group will get rid of SAS. So, my question may not be very clear for professional R user. I always dealing with column in data frame, not data vector. Many thanks to Greg's example. it is very helpful. one more question, how can I know if the function is for column manipulations or for vector? Thank you, Kai On Wednesday, July 7, 2021, 10:36:53 PM PDT, Greg Minshall <minsh...@umich.edu> wrote: > sub( "\\.[^.]*$", "", fname )
fwiw, i almost always use '[.]' in preference to '\\\\\\\\.', as it seems to be more likely to get through the various levels of quoting in different contexts. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.