Maybe you could use rbind2, which has an S4 generic in the methods package, instead?
# BOD is a data frame built into R foo <- structure(BOD, class = c("bar", "data.frame")) setOldClass("bar") setMethod("rbind2", signature(x = "bar", y = "bar"), function(x, y) { cat("Hello!\n") class(x) <- class(y) <- "data.frame" rbind(x, y) }) # test foo <- structure(BOD, class = c("bar", "data.frame")) rbind2(foo, foo) On 9/27/06, Vincent Goulet <[EMAIL PROTECTED]> wrote: > Hum. Then, I need to be more accurate. My object is of class > c("bar", "data.frame"). So, by virtue of ... > > The dispatch algorithm is described in the source file > ('.../src/main/bind.c') as > > 1. For each argument we get the list of possible class > memberships from the class attribute. > > 2. We inspect each class in turn to see if there is an an > applicable method. > > ... rbind(foo) is never sent to rbind.bar(). So I guess my questions stand. > > Le Mercredi 27 Septembre 2006 16:16, Gabor Grothendieck a écrit: > > Actually you can add your own method. See > > > > library(zoo) > > rbind.zoo > > > > for an example. > > > > On 9/27/06, Vincent Goulet <[EMAIL PROTECTED]> wrote: > > > I created a type of object similar to a data frame. In some > > > circumstances, It needs special methods for "[" and "[<-" and rbind() > > > (but not cbind()). Then I found this in the cbind()/rbind() man page: > > > > > > The method dispatching is _not_ done via 'UseMethod()', but by > > > C-internal dispatching. Therefore, there is no need for, e.g., > > > 'rbind.default'. > > > > > > This seems to imply I cannot add my own method. Is there 1) a workaround > > > to and 2) a rationale for this? (Other than creating a generic Rbind() or > > > whatever, that is.) > > > > > > I'm using S3 methods. > > > > > > Thanks in advance! > > > > > > -- > > > Vincent Goulet, Associate Professor > > > École d'actuariat > > > Université Laval, Québec > > > [EMAIL PROTECTED] http://vgoulet.act.ulaval.ca > > > > > > ______________________________________________ > > > R-devel@r-project.org mailing list > > > https://stat.ethz.ch/mailman/listinfo/r-devel > > -- > Vincent Goulet, Associate Professor > École d'actuariat > Université Laval, Québec > [EMAIL PROTECTED] http://vgoulet.act.ulaval.ca > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel