Dear Paul,

Try also:

ddTable <-
 data.frame(Id=c(1,1,2,2),name=c("Paul","Joe","Bob","Larry"))

ddTable[unique(ddTable$Id),]

HTH,

Jorge


On Fri, Jun 6, 2008 at 9:35 AM, Emslie, Paul [Ctr] <emsliep@atac.mil> wrote:

> I want to take the first row of each unique ID value from a data frame.
> For instance
> > ddTable <-
> data.frame(Id=c(1,1,2,2),name=c("Paul","Joe","Bob","Larry"))
>
> I want a dataset that is
> Id      Name
> 1       Paul
> 2       Bob
>
> > unique(ddTable)
> Will give me all 4 rows, and
> > unique(ddTable$Id)
> Will give me c(1,2), but not accompanied by the name column.
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

	[[alternative HTML version deleted]]

