Perhaps something like this:
a$d <- ifelse(duplicated(a$a), 0, 1)
On Tue, Nov 23, 2010 at 1:33 PM, Joel <joda2...@student.uu.se> wrote:
>
> Is there any similar function in R to the first. in SAS?
>
> What it dose is:
>
> Lets say we have this table:
>
> a b c
> 1 1 5
> 1 0 2
> 2 0 2
> 2 0 NA
> 2 9 2
> 3 1 3
>
>
> and then I want do to do one thing the first time the number 1 appers in a
> and something else the secund time 1 appers in a and so on.
>
> so
>
> something similar to:
>
> if first.a {
> a$d<-1
> }else{
> a$d<-0
> }
>
> This would give me
>
> a b c b
> 1 1 5 1
> 1 0 2 0
> 2 0 2 1
> 2 0 NA 0
> 2 9 2 0
> 3 1 3 1
>
> Is there such a function in R or anything similar?
>
>
> thx
>
> //Joel
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/the-first-from-SAS-in-R-tp3055417p3055417.html
> Sent from the R help mailing list archive at Nabble.com.
>
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