On 7 Sep 2004, Peter Dalgaard wrote:
> This looks unintentional:
Not so.
> > d <- as.Date("2004-09-07")
> > dd <- as.Date("2004-10-04")
> > data.frame(d,dd,dd-d)
> Error in as.data.frame.default(x[[i]], optional = TRUE) :
> can't coerce difftime into a data.frame
> > F <- data.frame(d,dd)
> > F$foo <- dd-d
> > cbind(F,dd-d)
> Error in as.data.frame.default(x[[i]], optional = TRUE) :
> can't coerce difftime into a data.frame
>
> Basically, the issue is that as.data.frame on a classed object expects
> to find a method and there isn't any for difftime...
Difftime depends crucially on attributes on the vector. I wasn't
confident that they would be preserved as needed (and I think I had a
problem example). Since then we have fixed a lot of the subsetting
methods, but even so I am not 100% confident.
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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