/span>
<span id="cb18-4"><a href="Intro.html#cb18-4"></a><span class="kw">mean</span>(x, <span class="dt">na.rm =</span> <span class="ot">TRUE</span>) </span>
<span id="cb18-5"><a href="Intro.html#cb18-5"></a></span>
<span id="cb18-6"><a href="Intro.html#cb18-6"></a><span class="co"># Bad</span></span>
<span id="cb18-7"><a href="Intro.html#cb18-7"></a></span>
<span id="cb18-8"><a href="Intro.html#cb18-8"></a>x[,<span class="dv">1</span>]</span>
<span id="cb18-9"><a href="Intro.html#cb18-9"></a></span>
<span