Try this:

order(row_median)[names(row_median) == "R3"]

On Fri, Sep 12, 2008 at 5:22 AM, Jonsson, Pall <Pall.Jonsson@astrazeneca.com
> wrote:

> Dear R gurus,
>
> I have been struggling with this for a while and thought you might be able
> to give me some guidance.
>
> I have a data frame, on which I apply a row function.  The result looks to
> me like a vector that retains the old row names.  I then sort the vector and
> subsequently need to be able to identify the rank of certain values by
> searching for their row names.  See this mock example:
>
> > dframe <- data.frame("Col1"=c(10,20,30), "Col2"=c(2,4,6),
> "Col3"=c(5,10,7), row.names=c("R1","R2","R3"))
> > row_median<-apply(dframe,1,median)
> > row_median.sorted <- sort(row_median, decreasing=TRUE)
>
> > row_median.sorted
> R2 R3 R1
> 10  7  5
>
> I now want to know the rank of, say R3 in this vector.  I know I can use
> match() to find this using the vector values, however I need to use the
> header names (eg. "R3") rather than the value (7).
>
> Many thanks for your help,
> Pall
>
> ______________________________________________
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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.
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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