Hi Carrie,

Try

> x <- rle(a)
> rep(x$lengths, x$lengths)
[1] 1 2 2 1

HTH,
Jorge


On Sun, Feb 6, 2011 at 8:21 PM, Carrie Li <> wrote:

> Hello R-helpers,
>
> I have a question about counting numbers.
> Here is a simple example.
>
> a=c(2, 3, 3,4)
> > table(a)
> a
> 2 3 4
> 1 2 1
>
> so, I can to create another variables that has the corresponding counting
> numbers.
> In this case, I want to have:
>
> b=c(1,2,2,1)
>
> Is there any way coding for this ?
>
> Thanks for helps!
>
> Carrie--
>
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>
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