class SubMatrix implements Cloneable {

    public double get(final int row, final int col) {
        return m_data[m_start + row * m_row_inc + col * m_col_inc];
    }

    public  SubMatrix(final double[] data, final int nrows, final int ncols);
    public  SubMatrix(final double[] data, final int start, final int nrows,
            final int ncols, final int rowinc, final int colinc);
    public  SubMatrix(final SubMatrix m);

}