l-link">PlackettLuce</a></span><span class="op">(</span><span class="va">R3</span><span class="op">)</span></span>
<span></span>
<span><span class="co"># storability</span></span>
<span><span class="va">R4</span> <span class="op">=</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="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="fl">1</span>, <spa