Hello, First of all use ?dput to post a data example.
dput(head(x, 20)) # paste the output of this in a post Now, without a reproducible example it's difficult to say but maybe ?%in% x[x$Species %in% names(sp)[1:2],] Hope this helps, Rui Barradas Em 09-02-2014 00:03, Yuanzhi Li escreveu:
Hi, everyone I met a small problem when I want take a subset from a data frame. The data frame(x) looks like the followings(10 species with 3 measured traits): Species trait1 trait2 trait3 sp1 sp1 ... sp2 sp2 ... sp10 sp10 ... It would be easy if we want trait values for most abundant species, we can do that with the following codes sp<-table(x$Species) x[x$Species==names(sp)[1],] but why it doesn't work if we want to select traits values for more than one species(most abundant two species) with similar codes x[x$Species==names(sp)[1:2],] And there must be other solutions for this problem. Looking forward for your help. Thanks in advance! ______________________________________________ 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.
