Right, these warnings correctly go away with the changes currently in r-devel.
As I said in my mail, I do want to port them to 2.9.1 and was waiting for a little more testing. (Also, I'm about to move back to the East Coast for the summer, and will be out of touch for a few days next week. Seemed a bit nervy to make a change to the patched version just before disappearing, but if there's a strong argument I could.) John Roger Bivand wrote: > In released 2.9.0, we have been seeing warnings when installing sp, for > example: > > Warning in .checkS3forClass(class...@classname, where, names(exts)) : > Some of the superclasses in the definition of class "SpatialPoints" have > apparent S3 methods. > > DANGER: the new class will not inherit these methods. > Complain to the author of the superclass definitions. > > The apparent methods are "plot.Spatial", "summary.Spatial" > > Running R CMD check sp (or installing from CRAN) on 2.10.0 (2009-04-29 > r48433) does not generate any such warnings. For us, it would be helpful if > the extensions could be patched into 2.9.1 (although no user has complained, > curiously enough). > > Roger > > > > John Chambers-2 wrote: > >> Changes were committed today to the r-devel version of R to make S4 and >> S3 classes (and abnormal object types such as "environment") work >> together more consistently. >> >> Basically, S4 classes can now contain any S3 class or object type, and >> should now inherit S3 methods for these. Also, the main practical >> problem with defining S3 methods for other S4 classes (namely, that S4 >> inheritance was not recognized) has been fixed, to the extent possible. >> >> See ?Methods (especially the section on S3 methods). For details (there >> are quite a few) see the paper referenced there, >> http://stat.stanford.edu/~jmc4/classInheritance.pdf >> >> Since these changes arguably fix design flaws, I would like to see them >> in 2.9.1, so please test them out. For the moment, they are only in the >> r-devel version. >> >> There can be changes to current behavior. For example, I found one >> regression test for S4 methods that only worked because an apparent S3 >> method, sort.list, was NOT inherited by an S4 class that contained "list". >> >> John >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel >> >> >> > > [[alternative HTML version deleted]] ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
