Thank you so much!
jonathan
> Date: Fri, 14 Jan 2011 10:47:57 -0800
> From: spec...@stat.berkeley.edu
> To: jonathan.hughes...@live.com
> CC: r-help@r-project.org
> Subject: Re: [R] filtering a dataframe with a vector of rownames
>
> Jonathan -
> To make your approach work, you'd need to replace ==
> with %in%:
>
> > rows.to.keep<-which(rownames(data) %in% names.to.keep)
> [1] 1 3 4
>
> But to answer you're original question, remember that the
> point of rownames is that they can be used to index a
> data frame:
>
> > data[rows.to.keep,]
> [,1] [,2]
> a 1 2
> c 3 4
> d 4 5
>
>
> - Phil Spector
> Statistical Computing Facility
> Department of Statistics
> UC Berkeley
> spec...@stat.berkeley.edu
>
>
>
> On Fri, 14 Jan 2011, Jonathan Hughes wrote:
>
> >
> >
> > Hello,
> >
> > Here's my problem. I have a large data frame and a vector with some of its
> > row names. I'd like to have a new data frame only with those rows that
> > match this vector of row names.
> >
> > I tried this:
> >
> > data<-cbind(c(1,2,3,4,5,6),c(2,3,4,5,6,7))
> > rownames(data)<-c("a", "b", "c","d","e","f")
> > names.to.keep<-c("a", "c", "d")
> > rows.to.keep<-which(rownames(data)==names.to.keep)
> >
> > But it didn't work. Any suggestions?
> >
> > thanks a lot.
> >
> > Jonathan.
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
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> > 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.
> >
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