
Thank you so much!

jonathan

> Date: Fri, 14 Jan 2011 10:47:57 -0800
> From: spector@stat.berkeley.edu
> To: jonathan.hughes.10@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
>  					 spector@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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> >
 		 	   		  
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