1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.commons.math.analysis; 18 19 import java.io.Serializable; 20 21 import org.apache.commons.math.FunctionEvaluationException; 22 23 /** 24 * Auxillary class for testing solvers. 25 * 26 * @version $Revision: 480442 $ $Date: 2006-11-29 00:21:22 -0700 (Wed, 29 Nov 2006) $ 27 */ 28 public class QuinticFunction implements DifferentiableUnivariateRealFunction, Serializable { 29 30 private static final long serialVersionUID = -8866263034920607152L; 31 32 /* Evaluate quintic. 33 * @see org.apache.commons.math.UnivariateRealFunction#value(double) 34 */ 35 public double value(double x) throws FunctionEvaluationException { 36 return (x-1)*(x-0.5)*x*(x+0.5)*(x+1); 37 } 38 39 public UnivariateRealFunction derivative() { 40 return new UnivariateRealFunction() { 41 public double value(double x) throws FunctionEvaluationException { 42 return (5*x*x-3.75)*x*x+0.25; 43 } 44 }; 45 } 46 }