Dear R-ers, I don't understand the following, maybe someone will help me explain:
> setClasss('A') [1] "A" > new('a') Error in new("a") : trying to generate an object from a virtual class ("a") > setClass('b', contains='a') [1] "b" > new('b') An object of class “b” <S4 Type Object> In what way is B more concrete than A so that it's possible do instantiate B but not A? I don't quite get it. B adds nothing to nothing, and yet it's instantiable, while it's base is not. Makes no sense to me. -- Hun ______________________________________________ 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.