Message-ID: <41936E6C.1030902@statistik.uni-dortmund.de>
Date: 2004-11-11T13:51:40Z
From: Uwe Ligges
Subject: Logical "and"
In-Reply-To: <41B2867D@webmail2.ofir.dk>
Alexander Sokol wrote:
> Hello,
>
> I have the following very simple problem:
>
> Say I have two vectors,
>
> a<-c(1,7,4,5,9,11)
> b<-c(7,4,9)
>
> I would like to create a vector containing the elements in a which are not in
> b.
>
> Obviously, this is possible by writing
>
> a[a!=b[1] & a!=b[2] & a!=b[3]]
a[!(a %in% b)]
or see ?setdiff
Uwe Ligges
> But I would like a solution which is applicable to the situation where the
> number of elements in b is unknown.
>
> I have looked in the R manuals, the FAQ and the mailing lists, but have been
> unable to find a solution.
>
> Thank you for your replies,
> Alexander
>
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