title: Normalized Cross correlation
body: <p>Is there a neat a fast way of computing the normalised <em>cross correlation</em> of two signals in <strong>MATLAB</strong>?</p>
  
  <p>My two signals <code>X</code> and <code>Y</code>
  when I tried <code>C = normxcorr2(X,Y)</code> and plotted <code>C</code> my results did not look as I would expect</p>