See ?months.
methods(class = "Date")
would have got you there.
(Date is not an S4 class, so people should not be setting S4 methods
on it without very good reason, and there are none in R itself.)
On Thu, 28 Apr 2011, Joshua Wiley wrote:
Hi Russ,
One tool that might help could be ?methods and ?showMethods
For example:
## for S3
methods(class = "Date")
## for S4
showMethods(classes = "Date")
regarding getting the actual year, I would use (though there may be
better ways):
format.Date(as.Date("2010-01-01"), format = "%Y")
Call format(), not its methods, or use strftime() directly.
HTH,
Josh
On Thu, Apr 28, 2011 at 11:05 PM, Russ Abbott <russ.abb...@gmail.com> wrote:
Hi,
I'm still confused about how to find out what methods are defined for a
given class. For example, I know that
today <- Sys.Date()
will produce an object of type Date. But I'm not sure what I can do with
Date objects or how I can find out.
?Date
refers me to the Date documentation page. But it doesn't tell me how, for
example, to extract the current year from a date object.
I tried
year(today)Error: could not find function "year"
Is there some other function that does the job? I want a function f such
that > f(today) will return 2011. Perhaps there is no such function.
But in general I don't have any confidence that I would know how to find it
if it existed or that I would know how to assure myself that there was no
such function.
Thanks.
*-- Russ *
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--
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/
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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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