Message-ID: <20080314110025.GC24440@localdomain>
Date: 2008-03-14T11:00:25Z
From: Gábor Csárdi
Subject: Selecting elements in vector
In-Reply-To: <fb7c7e870803140337x3a17a4cftf50f223fff27de8d@mail.gmail.com>
Use %in%:
x [ x %in% y ]
G.
On Fri, Mar 14, 2008 at 12:37:45PM +0200, Rainer M Krug 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
>
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--
Csardi Gabor <csardi at rmki.kfki.hu> UNIL DGM