> So I was thinking of embedding it into a if else loop but I am stuck on 
how
> to define the "belongs to" in R syntax. Any hint will be much 
appreciated.

?ifelse    # handles vectors, while if() handles single values
?'%in%'    # also see match() and which()

Enjoy the day,
cur

-- 
Curt Seeliger, Data Ranger
Raytheon Information Services - Contractor to ORD
seeliger.c...@epa.gov
541/754-4638
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