[EMAIL PROTECTED] writes: > 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.
How about: setClass("foo", representation(members="numeric"), prototype(members=numeric(0))) That is, use a zero-length vector to signify a vector that isn't there. + seth -- Seth Falcon | Computational Biology | Fred Hutchinson Cancer Research Center BioC: http://bioconductor.org/ Blog: http://userprimary.net/user/ ______________________________________________ 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.