title: How to plot a 3D decision boundary in Python?
body: <p>I am trying to plot a 3D SVM with a rbf kernel but can't seem to get it to work. I have seem posts about 2d plots and I understand these. </p>
  
  <p>What I am doing is </p>
  
  <pre><code>xx = np.meshgrid(np.arange(x_min,x_max,1)
  # similar for yy and zz
  Z= clf.decision_function(np.c_[xx.ravel(),yy.ravel(),zz.ravel()])
  </code></pre>
  
  <p>How do I proceed after this step?</p>