[Rd] S4 Method Dispatch for Class Defined as Attribute

Sven E. Templer sven.templer at gmail.com
Tue Oct 7 11:01:24 CEST 2014

Is setOldClass the solution?


x <- list()
class(x) <- "foo"
setGeneric("bar", function(x) "bar generic")
setMethod("bar", "foo", function(x) "bar foo")

On 7 October 2014 10:00, Dario Strbenac <dstr7320 at uni.sydney.edu.au> wrote:
> Hello,
> I am writing an interface to some functions from the CRAN package pamr, which is poorly written.
> I have a S4 method I declared with setMethod. I'd like to provide a signature of "pamrtrained" which is the class of object that training creates. The last two lines of code of pamr.train are :
>     class(junk) = "pamrtrained"
>     junk
> How can I dispatch on these kinds of objects, other than making the signature be "ANY" and checking the class inside the S4 method ? Might these kinds of class assignments be deprecated in a future version of R ?
> --------------------------------------
> Dario Strbenac
> PhD Student
> University of Sydney
> Camperdown NSW 2050
> Australia
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