Hi r-help-boun...@r-project.org napsal dne 04.08.2011 14:56:09:
> a217 <aj...@case.edu> > Odeslal: r-help-boun...@r-project.org > > 04.08.2011 14:56 > > Komu > > r-help@r-project.org > > Kopie > > Předmět > > [R] Counting rows given conditional > > Hello, > > I have an input file that contains multiple columns, but the column I'm > concerned about looks like: > > "TR" > 5 > 0 > 4 > 1 > 0 > 2 > 0 > > To count all of the rows in the column I know how to do NROW(x$TR) which > gives 7. > > However, I would also like to count only the number of rows with values >=1 > (i.e. not 0). I've tried NROW(x$TR>=1) which did not give the intended > output. You are quite close. x$TR>=1 gives you logical vector TRUE/FALSE. You can compute count of TRUE values by sum(logical.vector) e.g. sum(x$TR>=1) Regards Petr > > Do any of you have any suggestions as to where I'm going wrong? > > > > -- > View this message in context: http://r.789695.n4.nabble.com/Counting-rows- > given-conditional-tp3718541p3718541.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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.