title: How to convert from Generic List<double[]> to double[]?
body: <p>I have a Generic list that contains multiple double arrays.</p>
  
  <pre><code>List&lt;double[]&gt; d_list;
  </code></pre>
  
  <p>Suppose it contains many elements(i.e double arrays).
  Now i want to:</p>
  
  <ol>
  <li>get each element</li>
  <li>convert that element from generic to double[]</li>
  </ol>
  
  <p>How to do it?</p>