title: Dymos: How can I record and visualize subsystem inputs/outputs?
body: <p>I am trying to optimize a similar problem as the <a href="https://openmdao.github.io/dymos/examples/commercial_aircraft.html" rel="nofollow noreferrer">&quot;Commercial Aircraft Range Maximization by Differential Inclusion&quot;</a> example using <strong>Dymos</strong>.</p>
  <p>Is there a way to see the variation of (for example) the lift coefficient for the optimized trajectory?
  It <strong>isn't</strong> a <strong>state</strong> or <strong>control</strong> variable, just some <strong>intermediate</strong> variable within the problem definition.</p>
  <p>I know there is the <code>.add_recorder()</code> method, but I'm not sure how to use it or whether it is the right solution.</p>