title: Understanding L2-norm in MATLAB
body: <p>I have two matrices, x and y, which are the same size. They are two estimations of the same data field. I want to quantify the difference between them across the whole matrix. Is <code>norm(x-y,2)</code> how this is normally done? What units is this in - if x and y are velocities in mm/sec, and I want to turn the L2-norm into a percentage of some reference velocity, does that make any sense?</p>
  
  <p>Should this belong in Math?</p>