[Rd] new behavior in model.response
Achim@Zeilei@ @ending from uibk@@c@@t
Thu Jun 28 00:58:49 CEST 2018
On Thu, 28 Jun 2018, Therneau, Terry M., Ph.D. via R-devel wrote:
> I now understand the issue, which leads to a different and deeper issue
> which is "how to assign a proper length to Surv objects".
> > Surv(c(1,2,3), c(1,0,1))
>  1 2+ 3
> The above prints as 3 elements and is conceptually 3 elements. But if I
> give it length method to return a 3 then I need a names method, and
> names<- pays no attention to my defined length. How do we conceive of
> and manage a vector whose elements happen to require more than one
> storage slot for their representation? An obvious example is the
> complex type, but it seems that had to be baked right down into the
I think you just have to implement all methods required to make it look
like a vector even if it is internally a matrix. Thus, you need methods
for length and for names and names<-. Internally, the names can be stored
as row names.
Further useful methods for "Surv" objects might include
- as.double/as.integer (presumably just extracting the "time"),
Possibly also a dedicated summary.
An example for such a class is our "paircomp" in "psychotools". But I'm
sure there are other/better examples elsewhere.
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