which(A < B)
On Nov 20, 2007, at 3:06 PM, Barb, Jennifer (NIH/CIT) [E] wrote: > Does anyone know which function (if any) will return the index of the > true locations in a Boolean vector? > > > > For instance: > > A=c(1,3,5,7,4); > > B=c(2,4,77,3,3); > > X=A<B; > > > > So X is: > >> X > > [1] TRUE TRUE TRUE FALSE FALSE > > > > I'd like to know if there is a function that will tell me the locations > of where the TRUE values are? for instance a vector that will list > that > the locations are at 1, 2, 3. This function is sometimes called loc() > in other languages. > > > > Thanks, > > Jennifer > > > > > > > > > > > > [[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.
