Dear R gurus I've a question concerning the transformation of a new S4 class (that I defined) and the existing class "POSIXlt". I did the following:
## Definition of the new class: setClass("dtime", representation(data = "POSIXlt"), prototype(data = as.POSIXlt("2004/06/01"))) ## Transformation between the new class "dtime" and "POSIXlt": setAs("dtime", "POSIXlt", def = function(from) { [EMAIL PROTECTED] }) setAs("POSIXlt", "dtime", def = function(from) { new("dtime", data = from) }) ## Create a new "dtime" object: (x1 <- new("dtime")) str(x1) ## Transformation to "POSIXlt" class works well: (y1 <- as(x1, "POSIXlt")) str(y1) ## Transformation to "dtime" class fails as(y2, "dtime") > Fehler in insertMethod(methods, sig, args, def, TRUE) : inserting method into non-methods-list object (class "NULL") ## This works properly new("dtime", data = y2) #################################################################### ## Now I put another setAs for the Subclass "POSIXt" setAs("POSIXt", "dtime", def = function(from) { new("dtime", data = from) }) ## and the transformation to "dtime" class works: as(y2, "dtime") I tried to understand what happend, without success. Could someone give me a hint or a reference (some help page or others) to improve my understanding, please? Thank you very much. I work with: platform i686-pc-linux-gnu arch i686 os linux-gnu system i686, linux-gnu status Under development (unstable) major 2 minor 1.0 year 2005 month 03 day 22 language R Regards, Christoph Buser -------------------------------------------------------------- Christoph Buser <[EMAIL PROTECTED]> Seminar fuer Statistik, LEO C11 ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND phone: x-41-1-632-5414 fax: 632-1228 http://stat.ethz.ch/~buser/ ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html