(apologies for out-of-thread response) Both plot() and SpatialPolygons are S4, so see:
https://cran.r-project.org/doc/manuals/r-release/R-exts.html#Namespaces-with-S4-classes-and-methods for guidance, probably importClassesFrom(sp, SpatialPolygons) importMethodsFrom(sp, plot) (untried), and list sp in Imports in DESCRIPTION. Roger -- Roger Bivand Department of Economics, Norwegian School of Economics, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; e-mail: roger.biv...@nhh.no http://orcid.org/0000-0003-2392-6140 https://scholar.google.no/citations?user=AWeghB0AAAAJ&hl=en ______________________________________________ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
