[R] Odp: Aggregation and the meaning of class

Karl Ove Hufthammer Karl.Hufthammer at math.uib.no
Mon Jun 2 16:43:26 CEST 2008

Chip Barnaby:

> My question is: How does one learn the specifics?  For the case at
> hand, what are the specialized methods associated with class "by"?

The methods for the (S3) generic function 'by':

$ methods(by)
[1] by.data.frame by.default

Functions for objects of class 'by':

$ methods(class="by")
[1] print.by

Note that both of these may be extended by loading additional packages.

Karl Ove Hufthammer

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