subset</span>, <span class='kw'>return_graph</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>)</pre>
    
    <h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a> Arguments</h2>
    <table class="ref-arguments">
    <colgroup><col class="name" /><col class="desc" /></colgroup>
    <tr>
      <th>btdata</th>
      <td><p>An object of class "btdata", typically the result ob of ob &lt;- btdata(..). See <code><a href='btdata.html'>btdata</a></code>.</p></td>
    </tr>
    