title: Modifying code to allow for multiple entries in x
body: <p>Is it possible to modify the code for the following function so as to allow for multiple entries in <code>x</code> (i.e. I want to query multiple points at once)? </p>
  
  <pre><code>def banana(x):
      return exp(((-x[0]**2/200))-0.5*(x[1]+0.05*(x[0]**2) - 100*0.05)**2)
  </code></pre>