[R] A Question Re ISOdatetime
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed Dec 14 17:39:39 CET 2011
On 14/12/2011 16:24, Alex Zhang wrote:
> Dear all,
> I am using the ISOdatetime function like this:
> test.info$TradeTime = with(test.info, mapply(FUN = ISOdatetime, Year, Month, Day, Hour, Minute, 60, "EST"))
> Where Year, Month etc are all numeric.
> I think ISOdatetime should return a POSIXct object. However, the result I obtained from the line above is all numeric. Could you please advise? I wish to get POSIXct.
ISOdatetime did: mapply threw away the class.
See its SIMPLIFY argument, which defaults to TRUE.
It this case it is unnecessary: e.g.
ISOdatetime(2011, c(11,12), c(30,1), 1, 30, 35, tz="EST")
A 'sec' value of 60 should not be used ... it indicates a leap second
which POSIX ignores.
> Thank you very much.
> - Alex
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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