:,1), trf(:,3), 'r-' )

        title ( 'A Predator Prey System' );
        xlabel ( 'Time' );
        ylabel ( 'Population' );
      </pre>
    </p>

    <p>
      <b>TRF_100</b> uses 100 timesteps, which are not enough.
      <ul>
        <li>
          <a href = "trf_100.txt">trf_100.txt</a>, the data.
        </li>
        <li>
          <a href = "trf_100.png">trf_100.png</a>, a plot.
        </li>
      </ul>
    </p>

    <p>
      <b>TRF_1000</b> uses 1000 timesteps; the solution does not explode,
 