title: Which way non-symmetric cost matrices work?
body: <p>I was trying to answer to this question <a href="https://stackoverflow.com/questions/28586009/traminer-substitution-cost/28629515#28629515">Traminer substitution cost</a></p>
  
  <p>And it occurred to me that I don't really know in what direction the matrix is treated by <code>TraMineR</code>. Let's say for example that i have the following matrix</p>
  
  <pre><code>   A   B
  
  A  0   1
  
  B  2   0
  </code></pre>
  
  <p>does that mean that <code>TraMineR</code> considers A->B cost is 2 or that B->A cost is 2 ?</p>
  
  <p>thanks !</p>