title: Matrix multiplication using Matrix Template library (MTL 4)
body: <p>The program is as following:</p>
  
  <pre><code>#include &lt;iostream&gt;
  #include &lt;boost/numeric/mtl/mtl.hpp&gt;
  using namespace mtl;
  int main(int argc, char* argv[])
  {
  dense_vector&lt;double&gt; a(5,1.0);
  dense_vector&lt;double&gt; b(5,2.0);
  a * trans(b);
  }
  </code></pre>
  
  <p>I want to calculate a * trans(b), but there is a compling error :C2893.
  Will someone help me? Thanks a lot!</p>