On 07/10/2008 10:41 AM, Terry Therneau wrote:
A simple example:
temp <- as.Date('2001-10-5')
class(temp)
"Date"
How do I tell if "Date" is implemented as an S3 or an S4 class type?
I tried ?class, but didn't see anything obvious. Functions like inherit() work
equally well with both types (which is a good thing).
I expect the answer will be obvious - once someone points it out to me.
You could use the isS4 function:
> temp <- as.Date('2001-10-5')
> isS4(temp)
[1] FALSE
Duncan Murdoch
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