[R] replace id by running number

[Dimitris Rizopoulos]

try this:

y <- c(4,4,4,2,45,12,12)
match(y, unique(y))


I hope it helps.

Best,
Dimitris


On 3/27/2010 4:42 PM, sun wrote:
> Dear all,
>
> I want to replace an (unsorted) id variable in a large dataset by a running
> number without changing the order of the cases.
>
> E.g.,
>
> y<- c(4,4,4,2,45,12,12)
>
> should be replaced by something like
>
> x<- c(1,1,1,2,3,4,4)
>
> Sorry for this simple question&  thank you very much for your help!
>
>
>
>
>
>
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>
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-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

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