title: Fastest way to fit a parabola to set of points?
body: <p>Given a set of points, what's the fastest way to fit a parabola to them? Is it doing the least squares calculation or is there an iterative way?</p>
  
  <p>Thanks</p>
  
  <p>Edit:
  I think gradient descent is the way to go.  The least squares calculation would have been a little bit more taxing (having to do qr decomposition or something to keep things stable).</p>