A Question Re ISOdatetime
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