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