[R] Access Rows in a Data Frame by Row Name
gunter.berton at gene.com
Wed Sep 13 21:11:39 CEST 2006
The answer is yes, you can access rows of a data.frame by rowname in the
same way as columns, which you could have found by merely trying it. Don't
overlook the value of a little experimentation as the fastest way to an
-- Bert Gunter
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Tony Plate
> Sent: Wednesday, September 13, 2006 11:02 AM
> To: Michael Gormley
> Cc: r-help at stat.math.ethz.ch
> Subject: Re: [R] Access Rows in a Data Frame by Row Name
> Matrix-style indexing works for both columns and rows of data frames.
> > x <- data.frame(a=1:5, b=6:10, d=11:15)
> > x
> a b d
> 1 1 6 11
> 2 2 7 12
> 3 3 8 13
> 4 4 9 14
> 5 5 10 15
> > x[2:4,c(1,3)]
> a d
> 2 2 12
> 3 3 13
> 4 4 14
> Time spend reading the help document "An Introduction to R" will
> probably be well worth it. The relevant sections are "5 Arrays and
> matrices", and "6.3 Data frames".
> -- Tony Plate
> Michael Gormley wrote:
> > I have created a data frame using the read.table command.
> I want to be able to access the rows by the row name, or a
> vector of row names. I know that you can access columns by
> using the data.frame.name$col.name. Is there a way to access
> row names in a similar manner?
> > [[alternative HTML version deleted]]
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