From: ted.hard...@manchester.ac.uk > > On 12-May-10 22:24:21, Erik Iverson wrote: > > (Ted Harding) wrote: > >> Greetings All, > >> > >> Out of curiosity, I've just done a very primitive experiment: > >> > >> Obj <- list(Fun=sum, Dat=c(1,2,3,4)) > >> Obj$Fun(Obj$Dat) > >> # [1] 10 > >> > >> That sort of thing (much more sophisticated) must be documented > >> mind-blowingly somewhere. Where? > >> > >> Where I stand right now: The above (and its immediately obvious > >> generalisations, like Obj$Fun<-cos) is all I know about it so far. > > > > Well functions are just an object in R, so lists can of > course contain > > them. My naive understanding is that you can think of > function calls > > as simply lists where the first element is the function > name, and the > > rest of the list are the arguments, so: > > > > > eval(as.call(Obj)) > > [1] 10 > > Well, that's a neat trick! (It seems to depend on my having > put the function name first in the list, though, which wasn't > done with any specific intent).
This has not much to do with OO in the usual sense, just how functions in R work. See: http://stat.ethz.ch/R-manual/R-devel/doc/manual/R-lang.html#Function-obj ects The styles of OO in S3 and S4 do not encapsulate methods into the class definitions. Andy > In fact, the sort of thing I have in mind as possible > applications for the idea in that simple example, is that one > could encapsulate a "Study" in a list, which would contain as > components the various datasets available (quite possibly of > different structures etc.), and the various functions which > one might use to analyse different datasets, or to combine > analyses, etc.; and possibly also a top-level "supervisor" > function which could ensure "social behaviour" in that mob of > entities. Pretty open-ended, really. > > Ted. > > -------------------------------------------------------------------- > E-Mail: (Ted Harding) <ted.hard...@manchester.ac.uk> > Fax-to-email: +44 (0)870 094 0861 > Date: 12-May-10 Time: 23:46:34 > ------------------------------ XFMail ------------------------------ > > ______________________________________________ > 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. > Notice: This e-mail message, together with any attachme...{{dropped:11}} ______________________________________________ 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.
