an class="op">]</span> <span class="co"># check</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] 9.541381</span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/eigen.html" class="external-link">eigen</a></span><span class="op">(</span><span class="va">A</span><span class="op">)</span><span class="op">$</span><span class="va">vectors</span><span class="op">[</span>,<span class="fl">1</span><span class="op">]</span></span></span>
<span class="r-out co"