Hi Jun, I think
merge(df1, df2) should do it. Best, Ista On Tue, Aug 14, 2012 at 3:05 PM, Jun Shen <jun.shen...@gmail.com> wrote: > Dear list, > > Let's say we have a data frame as follows, > >>expand.grid(a=1:5,b=c(1,5,10,20),DV=c(0.1,0.2,0.3))->df1 >>df1$DV<-rgamma(60,shape=10) > > columns a and b are two levels. DV is the column with values we are > interested in. > > Then another data frame df2 with values as follows > > data.frame(a=c(2,2,3,4,5),b=c(5,10,1,5,20))->df2 > > Now I want to a subset of df1 that match df2 at the both columns a and b. > Any idea? > > Thanks. > > Jun > > [[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.
