Thanks, to all. I didn't know about either *methods( ) *or the package * lubridate*, which seems like a very nice *Date *package.
*-- Russ * On Fri, Apr 29, 2011 at 1:35 AM, Kenn Konstabel <lebats...@gmail.com> wrote: > The function for getting the year from date is there in package > lubridate (as well as many other convenient functions to work with > dates). > > More generally, finding "all" methods for a given class may be a > little tricky. If "all" means everything you have installed and > currently attached to your search path then methods(class="Date") will > do it (for S3 classes). (but "The functions listed are those which > _are named like methods_ and may not actually be methods (known > exceptions are discarded in the code). ") The result depends on which > packages you have loaded: in my currently open R session, > methods("Date") lists 36 "possible methods" but after library(zoo) I > get two more ( "as.yearmon.Date" and "as.yearqtr.Date"). > > Regards, > Kenn > > > On Fri, Apr 29, 2011 at 9:05 AM, 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 * > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > > > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.