>sort</a></span><span class="op">(</span><span class="va">x3</span>, na.last <span class="op">=</span> <span class="cn">TRUE</span>, decreasing <span class="op">=</span> <span class="cn">TRUE</span>, empty.last <span class="op">=</span> <span class="cn">FALSE</span><span class="op">)</span></span>
<span><span class="co">#&gt; &lt;declared&lt;numeric&gt;[9]&gt;</span></span>
<span><span class="co">#&gt; [1]       5       4       3       2       1      NA NA(-91) NA(-91) NA(-92)</span></span>
<span><span clas