an> <span class="fu">mhalf</span><span class="op">(</span><span class="va">M</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">X</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span>            [,1]       [,2]</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1,]  1.6156515 -0.7334548</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [2,] -0.7334548  0.6434719</span>
<span class="r-in"><span><span class="fu"><a href="https: