/**
* Copyright (C) 2001-2017 by RapidMiner and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapidminer.com
*
* This program is free software: you can redistribute it and/or modify it under the terms of the
* GNU Affero General Public License as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License along with this program.
* If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.operator.validation.clustering.exampledistribution;
/**
* Calculates an item distribution measure by summing up the squares of the fraction of items in
* each cluster. The result is inverted, thus the higher the value, the better the items are
* distributed.
*
* @author Michael Wurst
*
*/
public class SumOfSquares implements ExampleDistributionMeasure {
@Override
public double evaluate(int[] x, int n) {
double result = 0;
for (int i = 0; i < x.length; i++) {
result = result + (((double) x[i]) / n) * (((double) x[i]) / n);
}
return result;
}
}