Apache Commons Math Linear Regression Question

[Oscar Bastidas]

Hello,

Would someone please tell me how I am supposed to acquire the actual
numeric coefficients for a linear regression using the
PolynomialCurveFitter class?

Below is my code (it's supposed to be a simple example) and when I print
out the variable that stores the coefficients, ("coeff" in the below
example) what is printed to the command line is a strange code:
*[D@1610302.*

This happens regardless of the order of the polynomial I request.

Would someone please help me with this?  Thanks.

*********************** CODE BELOW ******************************

import java.util.*;
import org.apache.commons.math3.fitting.PolynomialCurveFitter;
import org.apache.commons.math3.fitting.*;

public class MathTester
{
        public static void main(String[] args) {
        // Testing linear regression
        final WeightedObservedPoints obs = new WeightedObservedPoints();

                // Acquiring data points
                obs.add(-1.00, 2.021170);
                obs.add(-0.99, 2.221135);
                obs.add(-0.98, 2.099852);

               // Instantiate 2nd degree polynomial fitting
               final PolynomialCurveFitter fitter =
PolynomialCurveFitter.create(2);

                // Retrieve fitted coefficients of the fitted data
                final double[] coeff = fitter.fit(obs.toList());

               // Printing out coefficients
               System.out.println("The coefficients are: " + coeff);

       } // END 'main'
} // END class

************************************************************

Oscar

Oscar Bastidas, Ph.D.
Postdoctoral Research Associate
University of Minnesota