[R] How to duplicate each row in a data.frame?

[David Freedman]

I *think* this is from from 'StatsRUs' - how about

as.data.frame(lapply(df,function(x)rep(x,n)))

hth, david freedman


pengyu.ut wrote:
> 
> I want to duplicate each line in 'df' 3 times. But I'm confused why
> 'z' is a 6 by 4 matrix. Could somebody let me know what the correct
> way is to duplicate each row of a data.frame?
> 
> df=expand.grid(x1=c('a','b'),x2=c('u','v'))
> n=3
> z=apply(df,1
>     ,function(x){
>       result=do.call(rbind,rep(list(x),n))
>       result
>     }
>     )
> z
> 
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