org.beedraz.semantics_II.MathBugDemonstration.java Source code

Introduction

Here is the source code for org.beedraz.semantics_II.MathBugDemonstration.java

Source

package org.beedraz.semantics_II;

import static org.ppwcode.metainfo_I.License.Type.APACHE_V2;

import org.apache.commons.math.stat.descriptive.moment.Variance;
import org.ppwcode.metainfo_I.Copyright;
import org.ppwcode.metainfo_I.License;
import org.ppwcode.metainfo_I.vcs.SvnInfo;

@Copyright("2007 - $Date$, Beedraz authors")
@License(APACHE_V2)
@SvnInfo(revision = "$Revision$", date = "$Date$")
public class MathBugDemonstration {

    /**
     * @param args
     */
    public static void main(String[] args) {

        // difference between getResult and evaluate
        //      double[] values = new double[] {1.0, 2.0, Double.POSITIVE_INFINITY};
        //      Variance var1 = new Variance();
        //      double value1 = var1.evaluate(values);
        //      Variance var2 = new Variance();
        //      var2.incrementAll(values);
        //      double value2 = var2.getResult();
        //      System.out.println(value1);
        //      System.out.println(value2);

        // difference between getResult and evaluate
        double[] values = new double[] { 1.0, 2.0, Double.NEGATIVE_INFINITY };
        Variance var1 = new Variance();
        double value1 = var1.evaluate(values);
        Variance var2 = new Variance();
        var2.incrementAll(values);
        double value2 = var2.getResult();
        var2.evaluate(values);
        System.out.println(value1);
        System.out.println(value2);

        //    // evaluate method changes internal representation
        //    double[] values = new double[] {1.0, 2.0, Double.NEGATIVE_INFINITY};
        //    Variance var1 = new Variance();
        //    var1.incrementAll(values);
        //    System.out.println(var1.getN());
        //    System.out.println(var1.getResult());
        //    double value1 = var1.evaluate(values);
        //    System.out.println(var1.getN());
        //    System.out.println(var1.getResult());
        //    System.out.println(value1);

    }

}