Re: intersection of 2 dataframes ['Watchdog': checked]

[Paul Matthias Diderichsen <paulmatthias.diderichsen@abbott.com>]

Hi Jonathan.

s-news-owner@lists.biostat.wustl.edu wrote on 20.06.2006
17:34:15:
> I have two different dataframes, each with exactly the same columns.
> I wish to identify rows of data which are common to both.  

Are you looking for something like this?

> f<-data.frame(a=c(1,2,3),b=c(2,2,3))
> g<-data.frame(a=c(3,2,1),b=c(2,2,3))
> h<-rbind(f,g)
> h[duplicated(h),]
  a b 
5 2 2
> 

Kind regards,
Paul M. Diderichsen
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