title: axes3d.plot_wireframe(X,Y,Z) Error
body: <p>I'm trying to learn Python through a tutorial on youtube and I'm having some difficulies working with 3D graphs. Long stories short, I continuously get (if </p>
  
  <pre><code>Z.ndim != 2:
  AttributeError: 'list' object has no attribute 'ndim')
  </code></pre>
  
  <p>error while trying to launch this simple program: </p>
  
  <pre><code>from mpl_toolkits.mplot3d import Axes3D
  import matplotlib.pyplot as plt
  
  fig = plt.figure()
  
  chart = fig.add_subplot(1,1,1,projection = '3d')
  
  X,Y,Z = [1,2,3,4,5,6,7,8],[2,5,3,8,9,5,6,1],[3,6,2,7,5,4,5,6]
  
  chart.plot_wireframe(X,Y,Z)
  
  plt.show()
  </code></pre>
  
  <p>I know that it is related to the <code>Axes3.plot_wireframe()</code> method but Could anyone explain to me what's happening. </p>