link('pend', 'vibrating_pendulum', link_text='In this python notebook'))</script>, we set up a simulation environment to test your control law.  Try to understand the structure of the code: this workflow is quite general, and it could be a good starting point for your future Drake projects.  Implement your control law in the dedicated cell, and check your work using the animation and the plots at the end of the notebook.</li>

      </ol>

    </exercise>

    <exercise id="hopfield"><h1>Hopfield Networks</