x="-1"></a>    <span class="at">x =</span> <span class="fu">seq</span>(<span class="at">from =</span> <span class="sc">-</span><span class="dv">1</span>, <span class="at">to =</span> <span class="dv">1</span>, <span class="at">length.out =</span> <span class="dv">1000</span>),</span>
<span id="cb16-5"><a href="#cb16-5" aria-hidden="true" tabindex="-1"></a>    <span class="at">y =</span> <span class="fu">seq</span>(<span class="at">from =</span> <span class="sc">-</span><span class="dv">1</span>, <span class