> Does anybody know why get I this kind of strange situation:
>
> Browse[2]> hcEnd
> [1] "2009-03-29 06:30:00"
> Browse[2]> class(hcEnd)
> [1] "POSIXlt" "POSIXt"
> Browse[2]> is.na(hcEnd)
> [1] TRUE
pp<-as.POSIXlt("2009-03-29 06:30:00")
pp
[1] "2009-03-29 06:30:00"
class(pp)
[1] "POSIXlt" "POSIXt"
is.na(pp)
[1] FALSE
So we can't repeat your example.
--
Curt Seeliger, Data Ranger
Raytheon Information Services - Contractor to ORD
seeliger.c...@epa.gov
541/754-4638
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