Prof Brian Ripley wrote:
A Date object is not a vector. In released versions of R, data.frame()
only knows how to replicate vectors and factors.
That's a rather oblique way of saying that it actually does work with
the unreleased version:
> head(transform(airquality,Date=as.Date("1950-01-01")))
Ozone Solar.R Wind Temp Month Day Date
1 41 190 7.4 67 5 1 1950-01-01
2 36 118 8.0 72 5 2 1950-01-01
3 12 149 12.6 74 5 3 1950-01-01
4 18 313 11.5 62 5 4 1950-01-01
5 NA NA 14.3 56 5 5 1950-01-01
6 28 NA 14.9 66 5 6 1950-01-01
> R.version.string
[1] "R version 2.9.0 Under development (unstable) (2008-12-23 r47310)"
--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907
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