ss="va">x</span>, <span class="va">z</span><span class="op">)</span></span>
<span><span class="co">#&gt; [1] TRUE</span></span></code></pre></div>
<p>Demonstrate that row and column order are ignored.</p>
<div class="sourceCode" id="cb24"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="co"># Two columns from student, use key to order rows</span></span>
<span><span class="va">x</span> <span class="op">&lt;-</span> <span class="va">student</span><span class="op">[</span>, <spa