[R] Unique rows

[Dimitrios Rizopoulos]

if you want the first row for the unique 'aa' entries, try the following:

cc[!duplicated(cc$aa), ]


I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
      http://www.student.kuleuven.be/~m0390867/dimitris.htm



Quoting Lanre Okusanya <lanre.okusanya at gmail.com>:

> hello all,
>
> I have a dataset where the subjects are duplicated. How do I subset
> such that I can get only I row/subject.
>
> aa<-c(1,1,2,2,3,3,4,4,5,5,6,6)
> bb<-c(56,56,33,33,53,53,20,20,63,63,9,9)
> cc<-data.frame(aa,bb)
>
> I would like to subset df(cc) such that I can get
> aa bb
> 1 56
> 2 33
> 3 53
> 4 20
> 5 63
> 6 9
>
> I know this should be fairly easy but I can't figure how to do it in a
> dataframe and keep all my columns
>
> Thanks
>
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