Undocumented argument na.last in factor()

"Gregor" == Gregor Gorjanc <gregor.gorjanc at bfro.uni-lj.si>
    on Tue, 14 Mar 2006 09:58:22 +0100 writes:

Gregor> Hello!  I just noticed that argument na.last in
    Gregor> factor() is not documented. Did I miss something or
    Gregor> ...? I just wonder how base package passes then R
    Gregor> CMD check. I checked also in source man page in
    Gregor> R-devel.

I wondered too -- for a few moments only -- after reading your
message...

*BUT*  na.last  is *not* an argument to factor()!

Look more carefully  at   str(factor)  or args(factor)
(or the help page) !

Regards, 
Martin Maechler