Re: [Rd] Help for methods

From: Prof Brian Ripley <>
Date: Tue 19 Sep 2006 - 13:15:51 GMT

On Tue, 19 Sep 2006, hadley wickham wrote:

>> > Well, I know that, and you know that, but how is anyone supposed to
>> > figure it out? It means that you need to have a working knowledge of
>> > the S3 and S4 class systems before you can use the help to reliably
>> > get the documentation you need.
>> For S3 you do to understand that there are different methods, and it
>> is in `An Introduction to R'. And ?summary reminds you.
> But you also have to be able to identify if it is a S3 function or an
> S4 method (or an ordinary function).

Why not just type ?summary, which as I said, does tell you up front?

> The reason I find this so much of a problem is that when you are
> teaching R, one of the first things you want to do is teach your
> students how to use help. However, you can't teach them to use it
> effectively until they know an awful lot about how the call semantics
> of R.

In many years of teaching S/R I have not found that to be a problem.

Brian D. Ripley,        
Professor of Applied Statistics,
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

______________________________________________ mailing list
Received on Tue Sep 19 23:30:22 2006

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.1.8, at Tue 19 Sep 2006 - 14:30:10 GMT.

Mailing list information is available at Please read the posting guide before posting to the list.