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'is_ARPALdf' checks if the input object belongs to the class 'ARPALdf'
is_ARPALdf(Data)
The function returns 'True' if the object is of class 'ARPALdf' and it returns 'False' if the object isn't of class 'ARPALdf'
Object to check if the class of a dataframe is 'ARPALdf', i.e. ARPAL dataframe.
d <- get_ARPA_Lombardia_AQ_registry() is_ARPALdf(d)
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