Thanks Kevin, this indeed clarifies a bit the S3 method registration universe.
On 8 July 2015 at 15:48, Kevin Wright <kw.s...@gmail.com> wrote: > Not sure if this answers your question, but you can't unregister a method. > See > > http://tolstoy.newcastle.edu.au/R/help/06/07/30791.html > > Kevin Wright > > > On Wed, Jul 8, 2015 at 5:09 AM, Renaud Gaujoux > <ren...@mancala.cbio.uct.ac.za> wrote: >> Thank you for your reply Martin. >> Your code made me realize that S3 methods are added to the >> .__S3MethodsTable__. of the package that defines the generic, not to >> the ones defining the method itself. >> How does things work in the case of a method from one package B >> masking the one from another package A? I don't get any warning >> message and there seems to be only one entry in the relevant >> .__S3MethodsTable__. >> Aren't these tables updated when the masking package B is detached? >> >> On 7 July 2015 at 21:01, Martin Morgan <mtmor...@fredhutch.org> wrote: >>> On 07/07/2015 02:05 AM, Renaud Gaujoux wrote: >>>> >>>> Hi, >>>> >>>> from the man page ?methods, I expected to be able to build pairs >>>> (class,package) for a given S3 method, e.g., print, using >>>> >>>> attr(methods(print), 'info'). >>>> >>>> However all the methods, except the ones defined in base or S4 >>>> methods, get the 'from' value "registered S3method for print", instead >>>> of the actual package name (see below for the first rows). >>>> >>>> Is this normal behaviour? If so, is there a way to get what I want: a >>>> character vector mapping class to package (ideally in loading order, >>>> but this I can re-order from search()). >>> >>> >>> It's the way it has always been, so normal in that sense. >>> >>> There could be two meanings of 'from' -- the namespace in which the generic >>> to which the method belongs is defined, and the namespace in which the >>> method is defined. I think the former is what you're interested in, but the >>> latter likely what methods() might be modified return. >>> >>> For your use case, maybe something like >>> >>> .S3methodsInNamespace <- function(envir, pattern) { >>> mtable <- get(".__S3MethodsTable__.", envir = asNamespace(envir)) >>> methods <- ls(mtable, pattern = pattern) >>> env <- vapply(methods, function(x) { >>> environmentName(environment(get(x, mtable))) >>> }, character(1)) >>> setNames(names(env), unname(env)) >>> } >>> >>> >>> followed by >>> >>> nmspc = loadedNamespaces() >>> lapply(setNames(nmspc, nmspc), .S3methodsInNamespace, "^plot.") >>> >>> which reveals the different meanings of 'from', e.g., >>> >>>> lapply(setNames(nmspc, nmspc), .S3methodsInNamespace, >>>> "^plot.")["graphics"] >>> $graphics >>> stats graphics stats >>> "plot.acf" "plot.data.frame" "plot.decomposed.ts" >>> graphics stats stats >>> "plot.default" "plot.dendrogram" "plot.density" >>> stats graphics graphics >>> "plot.ecdf" "plot.factor" "plot.formula" >>> graphics stats graphics >>> "plot.function" "plot.hclust" "plot.histogram" >>> stats stats stats >>> "plot.HoltWinters" "plot.isoreg" "plot.lm" >>> stats stats stats >>> "plot.medpolish" "plot.mlm" "plot.ppr" >>> stats stats stats >>> "plot.prcomp" "plot.princomp" "plot.profile.nls" >>> graphics stats stats >>> "plot.raster" "plot.spec" "plot.stepfun" >>> stats graphics stats >>> "plot.stl" "plot.table" "plot.ts" >>> stats stats >>> "plot.tskernel" "plot.TukeyHSD" >>> >>> Also this is for loaded, rather than attached, namespaces. >>> >>> Martin Morgan >>> >>>> Thank you. >>>> >>>> Bests, >>>> Renaud >>>> >>>> visible >>>> from generic isS4 >>>> print.abbrev FALSE registered >>>> S3method for print print FALSE >>>> print.acf FALSE registered >>>> S3method for print print FALSE >>>> print.AES FALSE registered >>>> S3method for print print FALSE >>>> print.agnes FALSE registered >>>> S3method for print print FALSE >>>> print.anova FALSE registered >>>> S3method for print print FALSE >>>> print.Anova FALSE registered >>>> S3method for print print FALSE >>>> print.anova.loglm FALSE registered >>>> S3method for print print FALSE >>>> print,ANY-method TRUE >>>> base print TRUE >>>> print.aov FALSE registered >>>> S3method for print print FALSE >>>> >>>> ______________________________________________ >>>> R-devel@r-project.org mailing list >>>> https://stat.ethz.ch/mailman/listinfo/r-devel >>>> >>> >>> >>> -- >>> Computational Biology / Fred Hutchinson Cancer Research Center >>> 1100 Fairview Ave. N. >>> PO Box 19024 Seattle, WA 98109 >>> >>> Location: Arnold Building M1 B861 >>> Phone: (206) 667-2793 >>> >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel > > > > -- > Kevin Wright > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
