  </td>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">stepper</span><span class="special">.</span><span class="identifier">do_step</span><span class="special">(</span>
                  <span class="identifier">sys</span> <span class="special">,</span>
                  <span class="identifier">x</span> <span class="special">,</span>
                  <span class="identifier">t</span> <span class="special">,</span>
                  <span class="identifier"