Kimmo,
i'll be curious to see other, maybe more elegant, answers. in the
meantime, this seems to work.
----
x = data.frame(Source=rep(1:3,4),
Target=c(rep(1,3),rep(2,3),rep(3,3),rep(4,3)))
y <- apply(x, 1, function(y) return (c(n=min(y), x=max(y))))
res <- data.frame()
for (n in unique(y["n",])) {
unique(y["x",y["n",]==n])
res <- rbind(res, data.frame(A=c(n), B=unique(y["x",y["n",]==n])))
}
res
----
thanks for the question!
cheers, Greg
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