Oh,great. Thanks. On 8/7/07, Stephen Tucker <[EMAIL PROTECTED]> wrote: > > try > > grep(paste("^",b[2],"$",sep=""),a) > > > your version will match "b2": > > > grep("^b[2]$",c("b","b2","b3")) > [1] 2 > > > --- Shao <[EMAIL PROTECTED]> wrote: > > > Hi,everyone. > > > > I have a problem when using the grep. > > for example: > > a <- c("aa","aba","abac") > > b<- c("ab","aba") > > > > I want to match the whole word,so > > grep("^aba$",a) > > it returns 2 > > > > but when I used it a more useful way: > > grep("^b[2]$",a), > > it doesn't work at all, it can't find it, returning integer(0). > > > > How can I chang the format in the second way? > > > > Thanks. > > > > -- > > Shao > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > 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. > > > > > > > > ____________________________________________________________________________________ > Pinpoint customers who are looking for what you sell. > http://searchmarketing.yahoo.com/ >
-- Shao [[alternative HTML version deleted]] ______________________________________________ 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.