lass='fu'>list</span>(<span class='kw'>NULL</span>, <span class='fu'>c</span>(<span class='st'>"premiere"</span>, <span class='st'>"deuxieme"</span>)))</div><div class='output co'>#&gt;      premiere deuxieme
#&gt; [1,]        1        3
#&gt; [2,]        2        4</div></pre>
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    <h2>Contents</h2>
    <ul class="nav nav-pills nav-stacked">
      
      <li><a href="#format">Format</a></li>
      
      <li><a href="#examples">Examples</a><