Kien, if you want to add variables in a function definition that is predefined by a Generic and calls CallNextMethod you have to add the '…' argument as well.
> setMethod("do",signature(a="Achild"), > function(a,msg,...) { > print("do Achild") > callNextMethod() > }) Best Simon On Sep 19, 2013, at 8:58 AM, Kiên Kiêu <kien.k...@jouy.inra.fr> wrote: > Hi, > > I met a problem when invoking callNextMethod within a method associated with > a generic function taking ... as an argument. > > Here is the code > > setClass("Aparent",representation(x="numeric",y="numeric")) > setClass("Achild",contains="Aparent") > > setGeneric("do",def=function(a,...) standardGeneric("do")) > setMethod("do",signature(a="Aparent"), > function(a,msg) { > print("do Aparent") > }) > setMethod("do",signature(a="Achild"), > function(a,msg) { > print("do Achild") > callNextMethod() > }) > > myA <- new("Achild") > buf <- do(a=myA) # works > buf <- do(a=myA,msg="bonjour") # error > > The last call yields the following error message: > > Error in callNextMethod() : > in processing 'callNextMethod', found a '...' in the matched call, but no > corresponding '...' argument > > which I do not understand. Replacing "..." by "msg" in setGeneric makes it > work. But I don't like this limitation so much (unless I understand it). > > Regards. > > Kien > > ______________________________________________ > 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. ______________________________________________ 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.