/*********************************************************************
 * This class represents a two dimensional matrix of doubles.
 * 
 * @author Nathan Sprague + 
 * @version V1.0, 1/12
 *********************************************************************/
public class Matrix
{
    private int rows;
    private int columns;
    private double[][] data;

    /******************************************************************
     * Constructor for objects of class Matrix
     * @param  rows  Number of rows.
     * @param  cols  Number of columns.
     * @param  initialValue  Initial value of all matrix entries. 
     ******************************************************************/
    public Matrix(int rows, int cols, double initialValue)
    {
 













    }

    /******************************************************************
     * Return the value from the indicated location in the Matrix. 
     * No error checking is performed. 
     * 
     * @param  row  Row number.
     * @param  col  Column number. 
     * @return  The requested value. 
     ******************************************************************/
    public double getValue(int row, int col)
    {
 

    }

    /******************************************************************
     * Set the value at the indicated location in the Matrix. 
     * No error checking is performed. 
     * 
     * @param  row  Row number.
     * @param  col  Column number. 
     * @param  value The new value. 
     ******************************************************************/
    public void setValue(int row, int col, double value)
    {
  

    }


    // Other methods not shown... 
}


/*********************************************************************
 * This class represents a lower-triangular Matrix.
 * 
 * @author Nathan Sprague + 
 * @version V1.0, 1/12
 *********************************************************************/

public class LTMatrix
{
    int size;  // same number of rows as columns
    private double[][] data;

    /******************************************************************
     * Constructor for objects of class Matrix
     * @param  rows  Number of rows.
     * @param  cols  Number of columns.
     * @param  initialValue  Initial value of all values on and below 
     *                       the diagonal. 
     ******************************************************************/
    public LTMatrix(int size, double initialValue)
    {
 














    }

    /******************************************************************
     * Return the value from the indicated location in the Matrix. 
     * Any values from above the diagonal are guaranteed to be 0. 
     * No error checking is performed.
     *
     * @param  row  Row number.
     * @param  col  Column number. 
     * @return  The requested value. 
     ******************************************************************/
    public double getValue(int row, int col)
    {
 











    }

    // Other methods not shown... 
   
}