001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.math3.genetics;
018
019/**
020 * Fitness of a chromosome.
021 *
022 * @version $Id: Fitness.java 1416643 2012-12-03 19:37:14Z tn $
023 * @since 2.0
024 */
025public interface Fitness {
026
027    /**
028     * Compute the fitness. This is usually very time-consuming, so the value should be cached.
029     * @return fitness
030     */
031    double fitness();
032
033}