Hello, Package 'ggplot2' defines `ggplot()` as an S3 generic.
My package 'ggspectra' defines some specializations of ggplot() for additional classes, which work as expected together with all packages extending 'ggplot2' that I have tested, except for 'ggtern'. Package 'ggtern' imports 'ggplot2' and then redefines the ggplot() generic with exactly the same code as in 'ggplot2' itself. If one attempts to use my package and 'ggtern' in the same session, dispatch fails for the ggplot() specializations defined in my package, unless an explicit call to ggplot2::ggpplot() is used. I do not understand why the generic needs to be redefined in 'ggtern', and although I have raised an issue for 'ggtern' last November, the just released version of 'ggtern' retains the redefinition of the generic. So, I have some questions: 1) Can I do anything in my own package to ensure that method dispatch works correctly even after 'ggtern' is attached? 2) Is it good practice for a package to redefine a generic from an imported package? 3) Is it possible to redefine a generic, without disturbing the dispatch of specializations already known to R? Thanks in advance for any insights, Pedro. -- ------------------------------------------------------------------------ Pedro J. Aphalo University Lecturer, Principal Investigator (Office 4417, Biocenter 3, Viikinkaari 1) Department of Biosciences Plant Biology P.O. Box 65 00014 University of Helsinki Finland e-mail: pedro.aph...@helsinki.fi <mailto:pedro.aph...@helsinki.fi> Tel. (mobile) +358 50 4150623 Tel. (office) +358 2941 57897 ------------------------------------------------------------------------ *Web sites and blogs* Web site (research group): http://blogs.helsinki.fi/senpep-blog/ Web site (own teaching): http://www.helsinki.fi/people/pedro.aphalo/ Web site (using R in photobiology): http://www.r4photobiology.info/ ------------------------------------------------------------------------ *Societies* UV4Plants <http://www.uv4plants.org/> (communications officer), ESP <http://www.photobiology.eu/> (member) SEB <http://www.sebiology.org/> (member), BES <http://www.britishecologicalsociety.org/> (member), SPPS <http://www.spps.fi/> (member), SMS <http://www.metsatieteellinenseura.fi/english> (member), TUG <http://tug.org/> (member), FOAS <http://www.foastat.org/> (member). ------------------------------------------------------------------------ [[alternative HTML version deleted]] ______________________________________________ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
