title: Mean of vectors
body: <p>I'm facing what looks like a simple a issue of computing a mean value (average) of vectors.
  Looking around for a standard or a definition for calculating a "mean vector" for a group of vectors only taught me that this isn't a straight forward issue so here I'm writing this question.</p>
  
  <p>I have 2 Vectors:</p>
  
  <p>[Amp1,theta1] &amp; 
  [Amp2,theta2]</p>
  
  <p>And I would say that my question is:</p>
  
  <ol>
  <li><p>What is a "mean vector" for 2 or more vectors (if such definition exists)?</p></li>
  <li><p>How do I compute one (I guess that If I know 1, I also got 2)?</p></li>
  </ol>