class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/prod.html" class="external-link">prod</a></span><span class="op">(</span><span class="va">dim</span><span class="op">[</span><span class="fl">1</span><span class="op">:</span><span class="fl">3</span><span class="op">]</span><span class="op">)</span>, ncol <span class="op">=</span> <span class="va">dim</span><span class="op">[</span><span class="fl">4</span><span class="op">]</span><span class="op">)</span></span></span>
<span class="r-in"