Re: [R] Selecting elements in vector

From: Henrique Dallazuanna <wwwhsd_at_gmail.com>
Date: Fri, 14 Mar 2008 08:10:58 -0300

Try this:

x[x %in% y]

On 14/03/2008, Rainer M Krug <r.m.krug_at_gmail.com> wrote:
> Hi
>
> Consider the following code
>
> > x <- rep(1:13, 13)
>
> > y <- 1:3
>
> I want to select all elements in x which are equal to 1, 2 or 3.
>
> I know that I could use
>
> > sel <- x==y[1] | x==y[2] | x==y[3]
> > x[sel]
>
> to obtain the values, but in my analysis, the y-vector is thousands of
> elements long.
>
> Is there any way, that I can do that easily?
>
> Thanks
>
> Rainer
> --
> Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation Biology (UCT)
>
> Plant Conservation Unit Department of Botany
> University of Cape Town
> Rondebosch 7701
> South Africa
>
> ______________________________________________
> R-help_at_r-project.org 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.
>

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

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Received on Fri 14 Mar 2008 - 11:19:40 GMT

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