class SubMatrix implements Cloneable {

    public void move(final int dr, final int dc) {
        m_start += dr * m_row_inc + dc * 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);

}