tup1.set(0, 4.0);
dBag1.add(tup1);
input = TupleFactory.getInstance().newTuple(2);
input.set(0, dBag);
input.set(1, dBag1);
output = cor.exec(input);
it = output.iterator();
ans = (Tuple) it.next();
assertEquals((String)ans.get(0),"a");
assertEquals((String)ans.get(1),"b");
assertEquals(0.582222509739582, (Double)ans.get(2) ,0.0005);