But i need for each id have two data. 
Like...
> x
   id v1 V2
1   1  1 12
2   1  2 13

4   2  4 15
5   2  5 16


8   3  8 19
9   3  9 20

11  4 11 22
12  4 12 23

So should write sample( if sample id >2  ,2). I don't know how to write  (if
sample id >2). Thanks.
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