Re: [R] R design (was "Variable passed to function not used in function in select)

From: Peter Dalgaard <>
Date: Tue, 11 Nov 2008 23:29:31 +0100

Ben Bolker wrote:

> Sometime soon when I have the time and energy I will start
> campaigning for an additional "drop" argument to subset that
> does what one expects (!!??) with subsetted factor variables ...

Not that one again! For at least one other value of one, the expectation is the opposite: Factor levels do not go away just because they happen not to be present in data.

fct <- lapply(dd, is.factor)
dd[fct] <- lapply(dd[fct], "[", drop=TRUE)

and begone with it...

    O__  ---- Peter Dalgaard             ุster Farimagsgade 5, Entr.B
   c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
  (*) \(*) -- University of Copenhagen   Denmark      Ph:  (+45) 35327918
~~~~~~~~~~ - (              FAX: (+45) 35327907

______________________________________________ mailing list
PLEASE do read the posting guide
and provide commented, minimal, self-contained, reproducible code.
Received on Tue 11 Nov 2008 - 22:38:45 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Wed 12 Nov 2008 - 00:30:26 GMT.

Mailing list information is available at Please read the posting guide before posting to the list.

list of date sections of archive