title: How can I smooth a surface in MATLAB?
body: <p>I have a surface in matlab which is plotted using the following code:</p>
  
  <pre><code>[xi, yi] = meshgrid(S/K, days);
  vq = griddata(S/K, days, rbf/K, xi, yi,'natural');
  mesh(xi,yi,vq)
  </code></pre>
  
  <p>The resulting image is quite rough, and has lots of grid lines as there are roughly 200 data points in each vector. Is it possible to plot a mesh which has a smaller number of grid points (e.g. 20) which averages out an existing meshgrid, griddata surface?</p>