| /* |
| * 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.legacy.analysis; |
| |
| import org.apache.commons.math4.legacy.analysis.differentiation.DerivativeStructure; |
| import org.apache.commons.math4.legacy.analysis.differentiation.UnivariateDifferentiableFunction; |
| |
| /** |
| * Auxiliary class for testing solvers. |
| * |
| */ |
| public class QuinticFunction implements UnivariateDifferentiableFunction { |
| |
| /* Evaluate quintic. |
| * @see org.apache.commons.math4.legacy.UnivariateFunction#value(double) |
| */ |
| @Override |
| public double value(double x) { |
| return (x-1)*(x-0.5)*x*(x+0.5)*(x+1); |
| } |
| |
| @Override |
| public DerivativeStructure value(DerivativeStructure t) { |
| return t.subtract(1).multiply(t.subtract(0.5)).multiply(t).multiply(t.add(0.5)).multiply(t.add(1)); |
| } |
| |
| } |