Hi all,
Is there an existing function that provides the correct type of
missing value for a given vector? e.g.
NAof(1:3) # NA_integer_
NAof(pi) # NA_real_
NAof("a") # NA_character_
NAof(T) # NA
?
Thanks,
Hadley
--
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/