s.html#cb170-4"></a>  g<span class="op">$</span>x<span class="op">$</span>data &lt;-<span class="st"> </span>g<span class="op">$</span>x<span class="op">$</span>data[,<span class="kw">c</span>(<span class="st">&quot;e&quot;</span>, <span class="st">&quot;v&quot;</span>, <span class="st">&quot;i&quot;</span>)]</span>
<span id="cb170-5"><a href="advanced-topics.html#cb170-5"></a>  <span class="kw">return</span>(g)</span>
<span id="cb170-6"><a href="advanced-topics.html#cb170-6"></a>}</span>
<span id="cb170-7"