* summing function class
*
* @return returns instance of summing function
*/
private static SummingFunction createSummingFunction(Class summingFunctionClass) {
SummingFunction summingFunction = null;
try {
summingFunction = (SummingFunction) summingFunctionClass.newInstance();
} catch (InstantiationException e) {
System.err.println("InstantiationException while creating SummingFunction!");