  <a href = "p24_r8vec.m">p24_r8vec.m</a>, 
          sets or gets R8VEC parameters for problem 24.
        </li>
        <li>
          <a href = "p24_region.m">p24_region.m</a>, 
          returns the region type for problem 24.
        </li>
        <li>
          <a href = "p24_title.m">p24_title.m</a>, 
          prints a title for problem 24.
        </li>
        <li>
          <a href = "p25_default.m">p25_default.m</a>, 
          sets default values for problem 25.
        </li>
        <li>
     