Logical "and"

Hi

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.
a%in%b
[1] FALSE  TRUE  TRUE FALSE  TRUE FALSE
!a%in%b
[1]  TRUE FALSE FALSE  TRUE FALSE  TRUE
a[!a%in%b]
[1]  1  5 11

Is it OK?

Cheers
Petr
Obviously, this is possible by writing

a[a!=b[1] & a!=b[2] & a!=b[3]]

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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Petr Pikal
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Logical "and"

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