Thanks for all the suggestions. I realize that this isn't the most important thing in the world -- and as a newcomer to R I gather it's not the way most people use R anyway.
But I tried to do what looked like the simplest suggestion. open.account.2 <- function(total) { this <- environment() list( deposit = function(amount) { if(amount <= 0) stop("Deposits must be positive!\n") total <<- total + amount cat(amount, "deposited. Your balance is", this$balance(), "\n\n") }, withdraw = function(amount) { if(amount > total) stop("You don't have that much money!\n") total <<- total - amount cat(amount, "withdrawn. Your balance is", this$balance(), "\n\n") }, balance = function() { cat("Your balance is", this$total, "\n\n") } ) } When I ran it, this is what happened. > x <- open.account.2(100) > x$balance() Your balance is 100 OK so far. But > x$deposit(50) Error in cat(amount, "deposited. Your balance is", this$balance(), "\n\n") : attempt to apply non-function Am I doing this the wrong way? Thanks for your interest. *-- Russ * On Sat, Mar 19, 2011 at 6:33 PM, Bert Gunter <gunter.ber...@gene.com> wrote: > See also the proto package, I believe. > > -- Bert > > On Sat, Mar 19, 2011 at 5:51 PM, Janko Thyson > <janko.thyson.rst...@googlemail.com> wrote: > > You might want to check out Reference Classes (?SetRefClass). The object > > itself is stored in '.self' and can be referenced that way. > > > > HTH, > > Janko > > > > -----Ursprüngliche Nachricht----- > > Von: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > Im > > Auftrag von Russ Abbott > > Gesendet: Samstag, 19. März 2011 23:35 > > An: r-help@r-project.org > > Betreff: [R] Referring to objects themselves > > > > Is it possible to refer to an object from within a method, as in *this > *in > > Java? I can't find anything about this in the documentation. Sorry if I > > missed it. > > > > Thanks. > > > > *-- Russ Abbott* > > *_____________________________________________* > > *** Professor, Computer Science* > > * California State University, Los Angeles* > > > > * Google voice: 747-*999-5105 > > * blog: *http://russabbott.blogspot.com/ > > vita: http://sites.google.com/site/russabbott/ > > *_____________________________________________* > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > 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. > > > > > > -- > Bert Gunter > Genentech Nonclinical Biostatistics > [[alternative HTML version deleted]]
______________________________________________ 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.