ata
frames are equivalent after reordering columns and rows. Accessible by
loading midfieldr.</p>
<p><em>Example.</em>   Demonstrate that the following implementations of
<code><a href="../reference/select_required.html">select_required()</a></code> yield identical results.</p>
<div class="sourceCode" id="cb23"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="co"># Required argument explicitly named</span></span>
<span><span class="va">x</span> <span class="op">&lt;-</span> 