Hi If you want to get rid of regular expressions at all and your A values start AWI for Arctic and UFT for boreal you can
DF$D <- ifelse(substr(DF$A, 1,1) == "A", "Arctic", "Boreal") Regards Petr > > Hello, > I am just starting with R and I am having a (most probably) stupid problem > by creating a new variable in a data.frame based on a part of another > character variable. > > I have a data frame like this one: > > > A B C > AWI-test1 1 i > AWI-test5 2 r > AWI-tes75 56 z > UFT-2 5 I > UFT56 f t > UFT356 9j t > etc. etc. 89 t > > > I now want to look in the variable A if the string AWI is present and then > create a variable D and putting "Arctic" inside. However, if the string > UFT occurs in the variable A, then the variable D shall be "Boreal" etc. etc. > > The resulting data.frame file should look like > A B C D > AWI-test1 1 i Arctic > AWI-test5 2 r Arctic > AWI-tes75 56 z Arctic > UFT-2 5 I Boreal > UFT56 f t Boreal > UFT356 9j t Boreal > etc. etc. 89 t > > > I know how to do this when I want to look for the entire string of A means > when there is "AWI-test1" and then create the variable D with "Arctic" but > not how to look only for a substring in A? > Would be great if somebody might help. > Thanks > Philipp > > > > *************************************************** > > > [[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. ______________________________________________ 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.
