if the records are in the file dupIDs.txt, then when you read them in,
the IDs become factors. Coercing them to numeric gets them to assign
a unique number to each factor.
So, you could try the following:
dupIDs <- read.table("dupIDs.txt", header = T)
dupIDs$ID2 <- cummax(as.numeric(dupIDs$ID)-1)
> dupIDs
ID record ID2
1 1 20 1
2 . 30 1
3 . 25 1
4 2 26 2
5 . 15 2
6 3 21 3
HTH,
Andrew.
On Dec 15, 12:56 pm, "Zhixin Liu" <z...@efs.mq.edu.au> wrote:
> Hi R helpers,
>
> If I have a dataset looks like:
> ID record
> 1 20
> . 30
> . 25
> 2 26
> . 15
> 3 21
> 4.....................
>
> And I want it becomes
> ID record
> 1 20
> 1 30
> 1 25
> 2 26
> 2 15
> 3 21
> 4.....................
>
> That is, I have to duplicate IDs for those with multiple records. I am
> wondering it is possible to be done in R, and I am grateful if you would like
> to show me the direction.
>
> Many thanks!
>
> Zhixin
>
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