playground.johannes.socialnetworks.statistics.PowerLawDistribution.java Source code

Introduction

Here is the source code for playground.johannes.socialnetworks.statistics.PowerLawDistribution.java

Source

/* *********************************************************************** *
 * project: org.matsim.*
 * PowerLawDistribution.java
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 * copyright       : (C) 2011 by the members listed in the COPYING,        *
 *                   LICENSE and WARRANTY file.                            *
 * email           : info at matsim dot org                                *
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *   See also COPYING, LICENSE and WARRANTY file                           *
 *                                                                         *
 * *********************************************************************** */
package playground.johannes.socialnetworks.statistics;

import org.apache.commons.math.FunctionEvaluationException;
import org.apache.commons.math.analysis.UnivariateRealFunction;

/**
 * @author illenberger
 *
 */
public class PowerLawDistribution implements UnivariateRealFunction {

    private final double exponent;

    private final double factor;

    public PowerLawDistribution(double exponent, double factor) {
        this.exponent = exponent;
        this.factor = factor;
    }

    @Override
    public double value(double x) throws FunctionEvaluationException {
        return factor * Math.pow(x, exponent);
    }

}