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Java example source code file (SumSincFunction.java)

This example Java source code file (SumSincFunction.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

multivariatefunction, sinc, sumsincfunction, univariatefunction

The SumSincFunction.java Java example source code

 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.commons.math3.analysis;

import org.apache.commons.math3.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}.
    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;


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