 tabindex="-1"></a>  <span class="fu">group_by</span>(g1, g2) <span class="sc">%&gt;%</span> </span>
<span id="cb2-3"><a href="#cb2-3" tabindex="-1"></a>  <span class="fu">summarise</span>(<span class="fu">across</span>(a<span class="sc">:</span>d, mean))</span></code></pre></div>
<p>We’ll start by discussing the basic usage of <code>across()</code>,
particularly as it applies to <code>summarise()</code>, and show how to
use it with multiple functions. We’ll then show a few uses with other
verbs. We’l