[R] how to get row name using the which function

[Uwe Ligges]

rownames(which(example == max(example), arr.ind=TRUE))

Uwe Ligges

On 02.05.2011 13:54, Schumacher, G. wrote:
> Dear All,
>
> Probably a very basic question, but can't seem to work my way around it.
>
> I want to which row has the maximum value. But what if the row names do not correspond with the row numbers. In the example below, you'll see that the max of example is row 4, but the name of row 4 is "9". How do I get R to return "9" as value, instead of 4.
>
> example<- matrix(c(0,0,0,1), 4, 1, dimnames=list(c("1", "3", "5", "9"), c("1")))
> which.max(example)
>
> [1] 4
>
> Hope someone can help out.
>
> Gijs Schumacher, MSc
> PhD candidate
>
> --------------------------------------
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