21"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb21-1"><a href="#cb21-1" tabindex="-1"></a>df <span class="sc">%&gt;%</span></span>
<span id="cb21-2"><a href="#cb21-2" tabindex="-1"></a>  <span class="fu">group_by</span>(g1, g2) <span class="sc">%&gt;%</span> </span>
<span id="cb21-3"><a href="#cb21-3" tabindex="-1"></a>  <span class="fu">summarise</span>(</span>
<span id="cb21-4"><a href="#cb21-4" tabindex="-1"></a>    <span class="fu">across</span>(<span class="fu">where</span>(is.nume