[R] questions on aggregate data

[Jacques VESLOT]

data.frame(x = with(df1, rep(x, freq)))
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Jacques VESLOT

CNRS UMR 8090
I.B.L (2ème étage)
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59019 Lille Cedex

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Fax : 33 (0)3.20.87.10.31

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zhijie zhang a écrit :
> Dear friends,
>  my question is how to aggregate dataset  and the inverse manipulation.
> e.g.My dataset
> data structure1:
> x
>  1
> 1
> 2
> 3
> 3
> data structure2:
> x  freq
> 1  2
> 2  1
> 3  2
> Then how to generate dataset2 from dataset1 and generate dataset1 from
> dataset2?
> 
> e.g. dataset2 from dataset1 :
> x<-c(1,1,2,3,3)
> a<-tab(x)
> as.data.frame(a)
> 
> *But i can't do the inverse manipulation:generate dataset1 from dataset2*,
> anybody can help me on the two different manipulations?
> 
> Thanks a lot!
> 
> 
> 
> 
>