n class="co"># and do not need to form a single contiguous unit if they are allocated</span></span></span>
<span class="r-in"><span><span class="co"># to zone 3</span></span></span>
<span class="r-in"><span><span class="va">zm7</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/matrix.html" class="external-link">matrix</a></span><span class="op">(</span><span class="fl">0</span>, ncol <span class="op">=</span> <span class="fl">3</span>, nrow <span class="op">=</span> <span