n class="r-in"></span>
<span class="r-in"><span class="co"># Define a closed form expression</span></span>
<span class="r-in"><span class="va">cf</span> <span class="op">&lt;-</span> <span class="fu"><a href="portal.html">closed_form</a></span><span class="op">(</span><span class="va">omit</span><span class="op">~</span><span class="va">omit</span><span class="op">~</span><span class="fl">3</span> <span class="op">*</span> <span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/base/Log.html" c