aria-hidden="true" tabindex="-1"></a><span class="co"># simulate delta</span></span>
<span id="cb2-14"><a href="#cb2-14" aria-hidden="true" tabindex="-1"></a>delta <span class="ot">&lt;-</span> (<span class="fl">0.5</span> <span class="sc">+</span> x[,<span class="dv">2</span>] <span class="sc">-</span> <span class="fl">0.5</span> <span class="sc">*</span> x[,<span class="dv">3</span>] <span class="sc">-</span> <span class="dv">1</span> <span class="sc">*</span> x[,<span class="dv">1</span>] <span class="sc