R help - Oct 2011 - Pb building sets of S4 / RefClass objects with package "sets"

Hi,

does anyone know if it is possible to construct sets of S4 objects?
It seems the constructor set does not like it:

Error in as.vector(x, "character") :
  cannot coerce type 'environment' to vector of type 'character'

Regards

Johnny

	[[alternative HTML version deleted]]