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.math4.legacy.analysis; 18 19 import org.apache.commons.math4.legacy.analysis.differentiation.DerivativeStructure; 20 import org.apache.commons.math4.legacy.analysis.differentiation.UnivariateDifferentiableFunction; 21 22 /** 23 * Auxiliary class for testing solvers. 24 * 25 */ 26 public class XMinus5Function implements UnivariateDifferentiableFunction { 27 28 /* Evaluate x - 5 function. 29 * @see org.apache.commons.math4.legacy.UnivariateFunction#value(double) 30 */ 31 @Override 32 public double value(double x) { 33 return x - 5; 34 } 35 36 @Override 37 public DerivativeStructure value(DerivativeStructure t) { 38 return t.subtract(5); 39 } 40 }