Well, c() is NULL, so R did as you asked it to. See ?integer: an integer vector of length 0 can be gotten by integer(0) (and other ways).
If you want integers, why have a slot which is numeric? > setClass("foo", representation(members="integer")) [1] "foo" > new("foo") An object of class "foo" Slot "members": integer(0) is the natural and simpler way to do this. On Mon, 13 Aug 2007, [EMAIL PROTECTED] wrote: > Hi, > > I have a class definition like this: > > setClass("foo", representation(members="numeric"), > prototype(members=c())) > > I intend my class to have members, a slot whose value should be a vector > of integer. When I initialize this class, I don't have any member yet. > So my member is blank. But if I run the above definition into R, it will > complain that my slot members is assigned to NULL which does not extend > class "numeric". So how can I fix this? Is there any clean way to do > this? This is quite a common situation but I can't seem to find a way > out. Any help would be really appreciated. Thank you. > > - adschai > > ______________________________________________ > 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 > and provide commented, minimal, self-contained, reproducible code. > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.