R help - Oct 2006 - how do I find the row index number, or row name, of a given value in a vector?

Hi,

I noticed that max(x) returns the maximum value of a vector, but the
function doesn't give the user the option of retrieving the row index number
instead. If I used max(x) to find the maximum value of vector x, then is
there a function I can use to find the index number, or row name, of the
maximum value?

Thanks,

Tom

	[[alternative HTML version deleted]]

--- tom soyer <tom.soyer at gmail.com> wrote:
> Hi,
> 
> I noticed that max(x) returns the maximum value of a
> vector, but the
> function doesn't give the user the option of
> retrieving the row index number
> instead. If I used max(x) to find the maximum value
> of vector x, then is
> there a function I can use to find the index number,
> or row name, of the
> maximum value?
> 
> Thanks,
> 
> Tom
?which 

Is this what you want to do?  
xx <- c(1,2,3,4,9,6,7,5)
bb <- max(xx)
bb
which(xx==bb)

?which.max

On 10/21/06, tom soyer <tom.soyer at gmail.com>
wrote:
> Hi,
>
> I noticed that max(x) returns the maximum value of a vector, but the
> function doesn't give the user the option of retrieving the row index
number
> instead. If I used max(x) to find the maximum value of vector x, then is
> there a function I can use to find the index number, or row name, of the
> maximum value?
>
> Thanks,
>
> Tom
>
>        [[alternative HTML version deleted]]
>
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