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Dimension2FitnessFunction.java
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Dimension2FitnessFunction.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.math4.examples.ga.mathfunctions;
import org.apache.commons.math4.ga.fitness.FitnessFunction;
/**
* This class represents the mathematical fitness function for optimizing a 2
* dimension mathematical function.
*/
public class Dimension2FitnessFunction implements FitnessFunction<Coordinate> {
/**
* Computes the fitness value based on the decoded chromosome.
* @param coordinate The {@link Coordinate}
* @return the fitness value
*/
@Override
public double compute(Coordinate coordinate) {
return -Math.pow(Math.pow(coordinate.getX(), 2) + Math.pow(coordinate.getY(), 2), .25) *
(Math.pow(Math.sin(50 * Math.pow(Math.pow(coordinate.getX(), 2) + Math.pow(coordinate.getY(), 2), .1)),
2) + 1);
}
}