Message-ID: <fb7c7e870803140337x3a17a4cftf50f223fff27de8d@mail.gmail.com>
Date: 2008-03-14T10:37:45Z
From: Rainer M Krug
Subject: Selecting elements in vector
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