     <a href = "cvt_sample.m">cvt_sample.m</a> 
          returns sample points.
        </li>
        <li>
          <a href = "data_read.m">data_read.m</a> 
          reads data from a file.
        </li>
        <li>
          <a href = "find_closest.m">find_closest.m</a> 
          finds the Voronoi cell generator closest to a point X.
        </li>
        <li>
          <a href = "get_seed.m">get_seed.m</a> 
          returns a seed for the random number generator.
        </li>
        <li>
         