On 25/06/2013 06:59, Rguy wrote:
Is there a simple way to obtain the time of day in R? I want the time of
day for computational purposes, not for display. I want to be able to
create code like the following:
if (time_of_day >= 22:00 & time_of_day <= 06:00) then X otherwise Y
which will not parse and in any case there are no such times.
I realize I could parse a date/time object and extract the time, but
hopefully other people have already done this, or there is a
straightforward representation of time of day in R that I have not been
able to find in the documentation.
> t <- Sys.time()
> tt <- format(t, "%H:%M")
> tt <= "22:00" && tt >= "06:00"
[1] TRUE
Note the use of && not &.
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--
Brian D. Ripley, rip...@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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