Prof Brian Ripley wrote: >>> Arguably, it should (Is this a difftime object? Which units?). >>> I'd advise against numeric operation on difftime objects in general, >>> because of the unspecified units. These are always "days" when working >>> with Date objects, but with general time objects it is not predictable. >>> So I'd recommend sqrt(as.numeric(temp, units="days")). >>> > > It fails by design. Using sqrt() on a measurement that has an arbitrary > origin would not have been good design. Er, _diff_time objects do have a well-defined origin at zero. Taking square roots (or exp, or...) of a number which could be weeks as well as days is the real issue, I think.
-- 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 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
