>>>>> "SM" == Stavros Macrakis <macra...@alum.mit.edu> >>>>> on Mon, 23 Nov 2009 11:24:24 -0500 writes:
SM> (I had sent this to r-help and got no responses -- perhaps r-devel is SM> a better list for this question?) Definitely better, yes. SM> How can I determine what S3 method will be called for a particular SM> first-argument class? SM> I was imagining something like functionDispatch('str','numeric') => SM> utils:::str.default , but I can't find anything like this. SM> For that matter, I was wondering if anyone had written a version of SM> `methods` which gave their fully qualified names if they were not SM> visible, e.g. SM> methods('str') => SM> utils:::str.data.frame utils:::str.default SM> stats:::str.dendrogram stats:::str.logLik utils:::str.POSIXt SM> or SM> methods('str') => SM> $utils SM> "str.data.frame" "str.default" "str.POSIXt" SM> $stats SM> "str.dendrogram" "str.logLik" I'm pretty sure that basically, the current methods() function "contains" the necessary information internally already (but beware: methods() is not the simplest of our functions !) I'd be welcoming back-compatible patches to methods() {*and* the corresponding *.Rd file !} which would provide such functionality. I think I would introduce a third optional argument (logical or character, specifying the "variants"), and the result could easily become back-compatible if the extra information you want is put as a new column in the "info" attribute (a data frame) of the current methods() result. SM> Thank you, You are welcome, Martin Maechler, ETH Zurich ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel