-> <double> c(<logical>, <character>) -> <character> c(<integer>, <logical>) -> <logical> c(<integer>, <integer>) -> <integer> c(<integer>, <double>) -> <double> c(<integer>, <character>) -> <character> c(<double>, <logical>) -> <double> c(<double>, <integer>) -> <integer> c(<double>, <double>) -> <double> c(<double>, <character>) -> <character> For atomic vectors, the rules are simple