
          sets or gets I4 parameters for problem 18.
        </li>
        <li>
          <a href = "p18_lim.m">p18_lim.m</a>, 
          returns the integration limits for problem 18.
        </li>
        <li>
          <a href = "p18_name.m">p18_name.m</a>, 
          returns a name for problem 18.
        </li>
        <li>
          <a href = "p18_r8.m">p18_r8.m</a>, 
          sets or gets R8 parameters for problem 18.
        </li>
        <li>
          <a href = "p18_r8vec.m">p18_r8vec.m</a>, 
   