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?
ss <- c("germany", "england", "brazil")
subset(test, x %in% ss | y %in% ss)
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