Re: [R] Subsetting to unique values

From: John Kane <jrkrideau_at_yahoo.ca>
Date: Fri, 06 Jun 2008 07:22:23 -0700 (PDT)


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

> From: Emslie, Paul [Ctr] <emsliep_at_atac.mil>
> Subject: [R] Subsetting to unique values
> To: r-help@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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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained,
> reproducible code.



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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. Received on Fri 06 Jun 2008 - 16:26:53 GMT

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