import java.util.Scanner;
import java.io.*;

/**
 * Hmwk15 introduces two-dimensional arrays.
 * 
 * @author D. Searls
 * @version 04/2007
 */
public class Hmwk15
{
    private static final int MAXSIZE = 100;
    
    /**
     * Main driver begins program execution.
     *
     * @param args program arguments
     */
    public static void main(String[] args) throws Exception
    {
        double[][] data = new double[MAXSIZE][2];
        int n;
        
        n = readFile(data);
        System.out.println();
        System.out.format("r = %6.4f", pearsonR(data, n));
        System.out.println();
    }
    
    /**
     * Read a file of paired data into the specified two-dimensional
     * array and return the number of data pairs read from the file.
     * This method asks the user for the name of the data file.
     * 
     * @param data the two-dimensional array to store the paired data
     * @return the number of data pairs read from the file
     */
    private static int readFile(double[][] data) throws Exception
    {
    }
    
    /**
     * Return the Pearson Product Moment Correlation Coefficient.
     * 
     * @param data the paired data
     * @param n the number of data pairs
     * @return the Pearson r correlation coefficient
     */
    private static double pearsonR(double[][] data, int n)
    {
    }
}