title: Making matrices in dart
body: <p>Ok guys, i've tried this:</p>
  
  <pre><code>List&lt;num&gt; test
  for(num i = ...){
     test[i]...
     (...)
      for(num j = ...){
        test[i][j] = ...
      }
  }
  </code></pre>
  
  <p>today but didn't seem to work. My question is... Is there a way to make this in Dart? :)</p>