I'm not sure you need grep: > all %in% some [1] TRUE FALSE TRUE FALSE FALSE TRUE
On Thu, May 19, 2016 at 7:58 PM, MacQueen, Don <macque...@llnl.gov> wrote: > Start with: > > > all <- c("ants","birds","cats","dogs","elks","fox") > > all[grep('ants|cats|fox',all)] > [1] "ants" "cats" "fox" > > Then construct the first arg to grep: > > > some <- c("ants","cats","fox") > > all[ grep( paste(some,collapse='|') , all)] > [1] "ants" "cats" "fox" > > > > -- > Don MacQueen > > Lawrence Livermore National Laboratory > 7000 East Ave., L-627 > Livermore, CA 94550 > 925-423-1062 > > > > > > On 5/19/16, 4:09 PM, "R-help on behalf of Steven Yen" > <r-help-boun...@r-project.org on behalf of sye...@gmail.com> wrote: > > >What is a good way to grep multiple strings (say in a vector)? In the > >following, I grep ants, cats, and fox separately and concatenate them, > >is there a way to grep the trio in one action? Thanks. > > > >all<-c("ants","birds","cats","dogs","elks","fox"); all > >[1] "ants" "birds" "cats" "dogs" "elks" "fox" > >some<-c("ants","cats","fox"); some > >[1] "ants" "cats" "fox" > >j<-c( > > grep(some[1],all,value=F), > > grep(some[2],all,value=F), > > grep(some[3],all,value=F)); j; all[j] > >[1] 1 3 6 > >[1] "ants" "cats" "fox" > > > > > > [[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. > > ______________________________________________ > 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. > [[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.