| /* |
| * 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.function.Sinc; |
| |
| /** |
| * Auxiliary class for testing optimizers. |
| * |
| */ |
| public class SumSincFunction implements MultivariateFunction { |
| private static final UnivariateFunction sinc = new Sinc(); |
| |
| /** |
| * Factor that will multiply each term of the sum. |
| */ |
| private final double factor; |
| |
| /** |
| * @param factor Factor that will multiply each term of the sum. |
| */ |
| public SumSincFunction(double factor) { |
| this.factor = factor; |
| } |
| |
| /** |
| * @param point Argument. |
| * @return the value of this function at point {@code x}. |
| */ |
| @Override |
| public double value(double[] point) { |
| double sum = 0; |
| for (int i = 0, max = point.length; i < max; i++) { |
| final double x = point[i]; |
| final double v = sinc.value(x); |
| sum += v; |
| } |
| return factor * sum; |
| } |
| |
| } |