[R] How to duplicate rows in dataframe?
Berton Gunter
gunter.berton at gene.com
Mon Dec 13 21:22:58 CET 2004
?match
ix<-df$index ## just for clarity
df[match(x,ix),]
-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
"The business of the statistician is to catalyze the scientific learning
process." - George E. P. Box
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of cstrato
> Sent: Monday, December 13, 2004 11:03 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] How to duplicate rows in dataframe?
>
> Dear all:
>
> I have the following (simple?) problem:
> Consider a dataframe where the first column contains
> integers used as index, e.g.
> index
> 24
> 13
> 46
> 32
>
> Now I have the following vector used to sort the dataframe:
> x <- c(13,24,32,46)
> Sorting the dataframe can be done by using order.
>
> However consider the following vector:
> x <- c(13,32,13,24,46,24,24)
> Now I want to get the dataframe in the order of the rows
> defined in x, i.e. the dataframe contains duplicate rows.
> One way to achieve this would be to use rbind in a for-loop.
>
> My question is:
> Is there an easier and - more important - faster way to
> obtain the dataframe as defined in x?
>
> Thank you in advance.
> Best regards
> Christian
> _._._._._._._._._._._._._._._._
> C.h.i.s.t.i.a.n S.t.r.a.t.o.w.a
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