[R] Count factor if

[mathijsdevaan]

Thanks for your quick response. The solution that you propose comes close to
what I want, however by using 'FUN = order', the new variable is based on
its order rather than y< focal y. In the case of two similar rows
(Xrow1=Xrow2 and Yrow1=Yrow2), the value of Zrow1 < Zrow2. Any solutions?
Thanks!  
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