title: Python: Is there a way to plot a "partial" surface plot with Matplotlib?
body: <p>I wanted to plot a "partial" surface plot like the following one with Matplotlib
  <a href="https://i.stack.imgur.com/7lwi9.png" rel="noreferrer"><img src="https://i.stack.imgur.com/7lwi9.png" alt="example"></a></p>
  
  <p>Note that it's not a complete meshgrid on X-Y plane but missing a corner from top view. The following is the code I tried but didn't work. </p>
  
  <pre><code>import numpy as np
  from matplotlib import pyplot
  from mpl_toolkits.mplot3d import Axes3D
  
  X = np.array([[0,1],
                [0,1,2],
                [0,1,2,3],
               ])
  Y = np.array([[0,0],
                [1,1,1],
                [2,2,2,2],
               ])
  Z = np.array([[0.5, 0.6],
                [0.7, 0.8, 0.9],
                [1.0, 1.1, 1.2, 1.3],
               ])
  fig = pyplot.figure()
  ax = fig.add_subplot(111, projection='3d')
  ax.plot_surface(X,Y,Z)
  </code></pre>
  
  <p>The error being:</p>
  
  <blockquote>
    <p>ValueError: setting an array element with a sequence.</p>
  </blockquote>
  
  <p>Any pointer would be appreciated!
  Thanks!</p>