[R] Logical "and"

[Jean Eid]

You can use setdiff if you only need the unique values of a that are not
in b. If you want all values you can use

a[a%in%setdiff(a,b)]

There are also intersection, union etc...
see
?setdiff


On Thu, 11 Nov 2004, 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]]
>
> 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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