[R] Finding common an unique elements in character vectors

[David Winsemius]

On Mar 29, 2010, at 1:53 PM, Thomas Jensen wrote:

> Dear R-list,
>
> I have a problem which I think is quite basic, but so far google has  
> not
> helped me.
>
> I have two vectors like this:
>
> vector_1 <- c(Belgium, Spain, Greece, Ireland, Luxembourg,  
> Netherlands,
> Portugal)
>
> vector_2 <- c(Denmark, Luxembourg)
>
> I would like to find the elements in vector_1 that are not in vector_2

?"%in%"

   # the help page for %in%  also defines a %w/o% operator as a worked  
example.


>
> so that i get a vector with these countries: Belgium, Spain, Greece,
> Ireland, Netherlands, Portugal.
>
> Thanks a lot,
>
> Thomas
>
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David Winsemius, MD
West Hartford, CT