ass="op">(</span><span class="fl">0</span>,<span class="va">p</span><span class="op">)</span></span>
<span class="r-in"><span class="va">beta</span><span class="op">[</span><span class="fl">1</span><span class="op">:</span><span class="fl">4</span><span class="op">]</span> <span class="op">=</span> <span class="fl">1</span></span>
<span class="r-in"><span class="va">X</span> <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/matrix.html" class="external-link">matrix</a></span><span c