ss="op">:</span><span class="fl">4</span><span class="op">]</span></span></span>
<span class="r-in"><span>  <span class="va">theta2</span> <span class="op">&lt;-</span> <span class="va">theta</span><span class="op">[</span><span class="fl">5</span><span class="op">:</span><span class="fl">8</span><span class="op">]</span></span></span>
<span class="r-in"><span>  <span class="fu"><a href="https://rdrr.io/r/base/sum.html" class="external-link">sum</a></span><span class="op">(</span><span class="fu"><a href="h