title: Contour plot with 3 vector
body: <p>I've a matrix <code>M</code> 10201x3 where the first 2 column are constant used to compute the response <code>Z</code> in column 3. Example:</p>
  
  <pre><code>....    ...     .................
  0.0031  0.02    0.792729854583740
  0.0031  0.03    0.802729845046997
  0.0031  0.04    0.812729895114899
  0.0031  0.05    0.822729885578156
  ....    ...     .................
  0.0034  0.02    0.867461800575256
  0.0034  0.03    0.877461791038513
  0.0034  0.04    0.887461841106415
  0.0034  0.05    0.897461831569672
  0.0034  0.06    0.907461822032929
  ....    ...     .................
  </code></pre>
  
  <p>I wanna make a contour plot where <code>X = M(:,1)</code>, <code>Y = M(:,2)</code> and <code>Z = M(:,3)</code> with different colors for different hights. I need to do the same thing in both 2D and 3D.</p>