Matrix

public class Matrix
{
  private int rows;
  private int columns;
  private double[][]theMatrix;
  /**
   * Constructor for class Matrix
   * @param setRows
   * @param setColumns 
   */
  public Matrix (int setRows, int setColumns)
    {
      this.rows = setRows;
      this.columns = setColumns;
      this.theMatrix = this.createMatrix();
    }
   /**
    * Creates an array according to this.rows and this.columns
    * @return 
    */
   protected double[][] createMatrix()
    {     
      return new double[this.getRows()][this.getColumns()];
    }
   
   public double[][] getMatrix()
    {
      return this.theMatrix;
    }
   public int getRows()
    {
        return this.rows;
    }
   public int getColumns()
    {
        return this.columns;
    }
   /**
    * sets a value within the matrix
    * @param posX
    * @param posY
    * @param val 
    */
   public void setAMatrixValue( int posX, int posY, double val)
    {
     this.theMatrix[posX][posY] = val;
     
    }
   public void setMatrix(double[][] mat)
   {
       this.theMatrix = mat;
   }
   /**
    * returns a value within the matrix
    * @param Xpos
    * @param Ypos
    * @return 
    */
   public double getAMatrixValue(int Xpos, int Ypos)
   {
       return this.theMatrix[Xpos][Ypos];
   }
   /**
    * multiplies all components in the matrix by a factor
    * @param aFactor 
    */
   public void multiplyMatrix(double aFactor)
   {
     for (int i = 0; i < this.getRows(); i++)
     {
       for (int j = 0; j <this.getColumns(); j++)
       {
         this.theMatrix[i][j] = this.getAMatrixValue(i, j) * aFactor;
       }
     }
   }
     /**
     * multiplies a matrix by a factor
     * overloads multiplyMatrix(double) 
     * in Matrix class
     * @param factor
     * @param mat
     * @return 
     */
   public double[][] multiplyMatrix(double factor, double[][] mat)
   {  
        for(int i = 0; i < this.getRows(); i++)
        {
            for (int j =0; j < this.getColumns(); j++)
                mat[i][j] = (mat[i][j] * factor);
        }
        return mat;
   } 
  
   /**
    * prints a component of the matrix
    * @param Xpos
    * @param Ypos 
    */
   public void printAVal(int Xpos, int Ypos)
   {
       System.out.println(this.getAMatrixValue(Xpos, Ypos));
   }
   
   
   /**
    * prints all components of the matrix
    * @param aMatrix 
    */
   public void matrixToString(double[][] aMatrix)
   {
        for (int i = 0; i < this.getRows(); i++)
        {
            for (int j =0; j <this.getColumns(); j++)
            {
                System.out.println(aMatrix[i][j]);
            }
        }
    }
   
}