/*
* RapidMiner
*
* Copyright (C) 2001-2011 by Rapid-I and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapid-i.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.preprocessing.transformation.aggregation;
/**
* This is an {@link Aggregator} for the {@link MeanAggregationFunction}
*
* @author Sebastian Land
*/
public class MeanAggregator extends NumericalAggregator {
private double sum = 0;
private double totalWeight = 0;
public MeanAggregator(AggregationFunction function) {
super(function);
}
@Override
public void count(double value) {
sum += value;
totalWeight++;
}
@Override
public void count(double value, double weight) {
sum += value * weight;
totalWeight += weight;
}
@Override
public double getValue() {
return sum / totalWeight;
}
}