[R] Subsetting to unique values

[John Kane]

I don't have R on this machine but will this work.  
myrows <- unique(ddTable[,1])
unis <- ddTable(myrows, ]


--- On Fri, 6/6/08, Emslie, Paul [Ctr] <emsliep at atac.mil> wrote:

> From: Emslie, Paul [Ctr] <emsliep at atac.mil>
> Subject: [R] Subsetting to unique values
> To: r-help at r-project.org
> Received: Friday, June 6, 2008, 9:35 AM
> 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.
> 
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