On my system all three of the ?summary commands listed in your
post bring up help (if you add the missing parenthesis to the middle one).
I am using "Version 2.3.1 Patched (2006-06-04 r38279)" on Windows XP.
On 9/18/06, hadley wickham <[EMAIL PROTECTED]> wrote:
> Help for help says:
>
> The 'topic' argument may also be a function call, to ask for
> documentation on a corresponding method. See the section on
> method documentation.
>
> and
>
> The authors of formal ('S4') methods can provide documentation on
> specific methods, as well as overall documentation on the methods
> of a particular function. The '"?"' operator allows access to
> this documentation in three ways.
>
> ...
>
> There are two different ways to look for documentation on a
> particular method. The first is to supply the 'topic' argument in
> the form of a function call, omitting the 'type' argument. The
> effect is to look for documentation on the method that would be
> used if this function call were actually evaluated. See the
> examples below. If the function is not a generic (no S4 methods
> are defined for it), the help reverts to documentation on the
> function name.
>
> Which doesn't explicitly mention whether this will work for S3 either
> way, but the results from:
>
> ?summary
> ?summary(lm(wt ~ mpg, data=mtcars)
> ?summary(data.frame())
>
> seem to indicate that it doesn't (at least in my R2.3.0, which is out
> of date, but I did also search the latest NEWS file for anthing
> mentioning help). Would it be possible to extend this method to deal
> with S3 classes as well?
>
> Hadley
>
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