[Rd] R1,9,0beta: strange summary of Date object
Prof Brian Ripley
ripley at stats.ox.ac.uk
Fri Apr 2 07:05:49 CEST 2004
On Thu, 1 Apr 2004 kjetil at entelnet.bo wrote:
> Hola!
>
> Any explanation of the following:
>
> > summary(as.Date(rep(NA,20)))
> Min. 1st Qu. Median Mean 3rd Qu.
> Max.
> NA NA NA NA NA
> NA
> NA's
> "1970-01-21"
>
> Where does this 1970 date come from?
By coercion. Same thing happens with POSIXct. It could be improved, but
seems to have caused no real problems in the POSIXct case.
--
Brian D. Ripley, ripley at stats.ox.ac.uk
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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