[R] Delete rows in the data frame by limiting values in two columns

From: Yi <liuyi.feier_at_gmail.com>
Date: Fri, 25 Jun 2010 12:00:11 -0700

Hi, folks,

Finally Friday~~ Here comes the question:

x=c('germany','poor italy','usa','england','poor italy','japan')


#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.

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