Hello, > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of A.J. Rossini > Sent: Wednesday, April 20, 2005 12:21 PM > To: Ali - > Cc: r-devel@stat.math.ethz.ch > Subject: Re: [Rd] Overloading methods in R > > R.oo tries to implement an old-fashioned OO system as found > in Java, Python, C++, etc. R's S4 methods implement a nice > modern system based on the generic function approach , > dispatch on argument signatures,
With all respect to R (and its developers) and for the records I couldn't help but refer to Ada'83 (not even '95 :-)) Best regards, Latchezar Dimitrov > which is different. > > While the R documentation for S4 classes is quite useful > (spanning the green book, the BioC developer help pages, > V&R's book on programming, and some other papers), I've found > that for a nice background, Paul Graham's ANSI Lisp book, and > in particular the nicely written chapter on CLOS, provides a > nice introduction to the thought process. > > With respect to the R.oo package, the author might be the > best source for that. > > Another package which you might take a look at is the proto > package, which provides prototype object-orientation similar > to that found in XLispStat, and also might help with what you > are trying to do. > However, I suspect that learning about the S4 system will > provide more benefit in the future. > > best, > -tony > > On 4/20/05, Ali - <[EMAIL PROTECTED]> wrote: > > Sean, > > > > Thanks, but, I am actually talking about overloading > 'methods' and not > > 'functions', or you may want to answer this question: How > to overload > > methods in classes created by R.oo package? > > > > > > > >On Apr 20, 2005, at 8:16 AM, Ali - wrote: > > > > > >>(1) It seems to me that, generally, in R it is not possible to > > >>overload functions. Is that right? > > >> > > >>(2) Assuming that the above is true, or partially true, > is there any > > >>extra packages to handle overloading in R? > > >> > > >>(3) Assuming (1) is TRUE and (2) is FALSE, can anyone > provide some > > >>advice on developing some function that understand what the > > >>arguments are and then calls the right overloaded function? > > >> > > >>It would be something like this: > > >> > > >>overloadedFunction1 <- function(x) {}; > > >> > > >>overloadedFunction2 <- function(x, y) {}; > > >> > > >>theFunction <- function(...) > > >>{ > > >> # How to identify ... and call the right overloaded function? > > >>} > > >> > > > > > >Ali, > > > > > >You are probably interested in "methods". Functions can have > > >different "methods" depending on what the arguments and > their types > > >are. A first place to look is: > > > > > > >http://cran.r-project.org/doc/manuals/R-exts.html#Generic-functions- > > >and-methods > > > > > >Sean > > > > > > > ______________________________________________ > > R-devel@stat.math.ethz.ch mailing list > > https://stat.ethz.ch/mailman/listinfo/r-devel > > > > > -- > best, > -tony > > "Commit early,commit often, and commit in a repository from > which we can easily roll-back your mistakes" (AJR, 4Jan05). > > A.J. Rossini > [EMAIL PROTECTED] > > ______________________________________________ > R-devel@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > ______________________________________________ R-devel@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-devel