Hi, Well, simply :
d[a<24,2] should do the trick. Pierrick Bruneau CRP Gabriel Lippmann On Wed, Mar 20, 2013 at 12:53 PM, Andras Farkas <motyoc...@yahoo.com> wrote: > Dear All, > > any thoughts on how I can do the following: > > let us say we have: > > a <-c(2,4,16,28,48) > b <-c(10,4,2,0.4,0.03) > d <-cbind(a,b) > > what I would like to do is to extract values of column b in the matrix > based on the corresponding values of column a. For example: I would like to > extract all b values that have a corresponding a value that is less than 24 > into a numeric vector, so let us say we name this new vector f, then the > results should look like: > > f <-c(10,4,2) > > as allways your help is greatly appreciated, > > Andras > [[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. > > [[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.
