[Rd] class extension and documentation

Duncan Murdoch murdoch.duncan at gmail.com
Mon Dec 5 19:48:19 CET 2011

On 05/12/2011 12:11 PM, Terry Therneau wrote:
> I've added a "backsolve" method to the bdsmatrix library.
> Per the Extending manual section 7.1 I've also added the following 3
> lines along with my setMethod definitions for 2 classes.
> backsolve<- function(r, ...) UseMethod("backsolve")
> backsolve.default<- base:::backsolve
> formals(backsolve.default)<- c(formals(backsolve.default), alist(...
> = ))
> I've also added a backsolve-methods.Rd page, though since my arguments
> are identical to the default it doesn't say much.  And, after a test
> failed, added the new backsolve.default routine to my export list.
> Now R CMD check claims that I need Rd pages for backsolve and
> backsolve.default.  I don't think I should rewrite those.
>     How do I sidestep this  and/or
>     what other manuals should I read?

Even though your change is subtle, I'd say it's still a change 
(backsolve is now a generic, not a simple closure; it now has a 
different argument list), so I'd like to see a new man page added.    It 
would be quite reasonable to list the new interface and then refer to 
base::backsolve for the details of what the default method does.

Duncan Murdoch

> Perhaps do setMethod("backsolve", signature(r="ALL"),
>                             base:::backsolve(r, ...))
> instead?
> Terry Therneau
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