R help - Jul 2007 - how to get the position of an element in a vector ?

Hi, dear R developers,

I've got a vector of monthly volatilities and i would like to get the
position of the highest volatility of the vector without computing a loop.
Is there a function that could give me such a result ?

a<-c(1,2,4,100,3)

the highest value is the fourth of the vector.
how can i get "4" without a loop going through the vector ?

Thanks !

Benoit.

	[[alternative HTML version deleted]]

which(a==max(a))


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

On 03/07/07, Benoit Chemineau <benoitchemineau@gmail.com>
wrote:
>
> Hi, dear R developers,
>
> I've got a vector of monthly volatilities and i would like to get the
> position of the highest volatility of the vector without computing a loop.
> Is there a function that could give me such a result ?
>
> a<-c(1,2,4,100,3)
>
> the highest value is the fourth of the vector.
> how can i get "4" without a loop going through the vector ?
>
> Thanks !
>
> Benoit.
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@stat.math.ethz.ch mailing list
> 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.
>
	[[alternative HTML version deleted]]

?which.max

------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
Thierry.Onkelinx op inbo.be
www.inbo.be 

Do not put your faith in what statistics say until you have carefully
considered what they do not say.  ~William W. Watt
A statistical analysis, properly conducted, is a delicate dissection of
uncertainties, a surgery of suppositions. ~M.J.Moroney

 
> -----Oorspronkelijk bericht-----
> Van: r-help-bounces op stat.math.ethz.ch 
> [mailto:r-help-bounces op stat.math.ethz.ch] Namens Benoit Chemineau
> Verzonden: dinsdag 3 juli 2007 16:12
> Aan: r-help op stat.math.ethz.ch
> Onderwerp: [R] how to get the position of an element in a vector ?
> 
> Hi, dear R developers,
> 
> I've got a vector of monthly volatilities and i would like to 
> get the position of the highest volatility of the vector 
> without computing a loop.
> Is there a function that could give me such a result ?
> 
> a<-c(1,2,4,100,3)
> 
> the highest value is the fourth of the vector.
> how can i get "4" without a loop going through the vector ?
> 
> Thanks !
> 
> Benoit.
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help op stat.math.ethz.ch mailing list
> 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.
>