title: Generate Equation from 3D surf Plot in Matlab
body: <p>I am wondering if anyone knows (or is it possible?) how to generate a trend equation from a 3D surf plot from Matlab? I understand that we can create trendline for 2D plots (linear and nonlinear) and show its equation, but how about 3D plot? Can we create something like: </p>
  
  <p>z = ax + by? </p>
  
  <p>Regards
  Kit</p>