[R] Still confused about classes

From: Russ Abbott <russ.abbott_at_gmail.com>
Date: Thu, 28 Apr 2011 23:05:45 -0700


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.


*-- Russ *

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