[R] Subsetting to unique values

From: Emslie, Paul [Ctr] <emsliep_at_atac.mil>
Date: Fri, 06 Jun 2008 09:35:42 -0400


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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