To follow up, my attempt at creating a minimal example went a bit too minimal.
What I _think_ actually happened to me is that I loaded two packages with identical-named S3 methods for a generic. Even after unloading the second package, the S3 methods for that package were still registered and somehow re-loaded (?) when I tried to print an object (of the same class) that had been created using the first package. I found a post by Professor Ripley which seems to confirm something to the effect that it is not possible to unregister S3 methods: http://tolstoy.newcastle.edu.au/R/help/06/07/30791.html In that sense, it appears that it is not possible to completely undo the loading of a package. Thanks to Bill Dunlap and Professor Ripley. Kevin Wright On Wed, Sep 24, 2014 at 2:16 PM, William Dunlap <wdun...@tibco.com> wrote: > Running pkg::func or pkg:::func has the side effect of loading pkg's > namespace, if it is not already loaded. Use remove.packages() to > remove the package from your machine if you want to make its namespace > unloadable. > > Bill Dunlap > TIBCO Software > wdunlap tibco.com > > > On Wed, Sep 24, 2014 at 11:56 AM, Kevin Wright <kw.s...@gmail.com> wrote: >> Sorry if this is well-known, but I can't find an answer or maybe just don't >> know how to ask Google the right question. If I run the following code in >> R (3.1.1), I find that lattice:::xyplot.formula is still available (or >> maybe just a promise to it ... ???) even though I've used detach and >> unloadNamespace. Is there another step I'm missing? >> >> require(lattice) >> head(lattice:::xyplot.formula) >> detach(package:lattice) >> search() # No longer on search list >> loadedNamespaces() # But namespace is still loaded >> unloadNamespace("lattice") >> loadedNamespaces() # Namespace not loaded >> head(lattice:::xyplot.formula) # It is still accessible >> >> Kevin >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. -- Kevin Wright ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
