Try this:
test[rowSums(mapply('%in%', test[c('x', 'y')],
list(c('germany','england','brazil')))) > 0,]

On Fri, Jun 25, 2010 at 4:00 PM, Yi <liuyi.feier@gmail.com> wrote:

> Hi, folks,
>
> Finally Friday~~  Here comes the question:
>
> x=c('germany','poor italy','usa','england','poor italy','japan')
> y=c('Spain','germany','usa','brazil','england','chile')
> s=1:6
> z=3:8
> test=data.frame(x,y,s,z)
>
> #Now I only concern the countries ('germany','england','brazil'). I would
> like to keep the rows where these three countries
> #are involved either in test$x OR test$y. So the result should be like as
> follows (I did this manually >< ):
>
>        x                y   s z
> 1    germany   Spain 1 3
> 2 poor italy germany 2 4
> 3    england  Brazil 4 6
> 4 poor italy england 5 7
>
> Any codes work for this?
>
> Thanks great in advance.
>
>        [[alternative HTML version deleted]]
>
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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