dBag1.add(tup1);
Tuple input = new Tuple(2);
input.setField(0, dBag);
input.setField(1, dBag1);
DataBag output = new DefaultDataBag();
COR.exec(input, output);
Iterator<Tuple> it = output.iterator();
Tuple ans = (Tuple) it.next();
assertEquals(ans.getAtomField(0).toString(),"a");
assertEquals(ans.getAtomField(1).toString(),"b");
assertEquals(0.582222509739582, ans.getAtomField(2).numval(),0.0005);