title: analogy to scipy.interpolate.griddata?
body: <p>I want to interpolate a given 3D point cloud:</p>
  
  <p>I had a look at scipy.interpolate.griddata and the result is exactly what I need, but as I understand, I need to input "griddata" which means something like <code>x = [[0,0,0],[1,1,1],[2,2,2]]</code>.</p>
  
  <p>But my given 3D point cloud don't has this grid-look - The x,y-values don't behave like a grid - anyway there is only a single z-value for each x,y-value.*</p>
  
  <p>So is there an alternative to scipy.interpolate.griddata for my not-in-a-grid-point-cloud?</p>
  
  <p>*edit:
  "no grid look" means my input looks like this:</p>
  
  <pre><code>x = [0,4,17]
  y = [-7,25,116]
  z = [50,112,47]
  </code></pre>