of two vectors.
        </li>
        <li>
          <b>DMACH</b> computes machine parameters of floating point arithmetic.
        </li>
        <li>
          <b>DNRM2</b> returns the euclidean norm of a vector. 
        </li>
        <li>
          <b>DROT</b> applies a plane rotation.
        </li>
        <li>
          <b>DROTG</b> constructs a Givens plane rotation.
        </li>
        <li>
          <b>DROTM</b> applies a modified Givens rotation matrix.
        </li>
        <li>
          <b>DRO