an></span>
<span class="r-in"><span><span class="va">vol_data</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/array.html" class="external-link">array</a></span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/stats/Normal.html" class="external-link">rnorm</a></span><span class="op">(</span><span class="fl">16</span><span class="op">^</span><span class="fl">3</span><span class="op">)</span>, dim <span class="op">=</span> <span class="fu"><a href="http