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...h symbols A and B (this is what expected) however subjects with type = 3 are plotted with a charcater 2 instead of a pch=21. I understand that this is due to the fact that the created vector "type_pch" cannot be a mixture between characters and numerics ... I tried to use a list for that purpsoe but fail... Any suggestions would be grateful, Many thanks, Bernard --------------------------------- [[alternative HTML version deleted]]