p">(</span> <span class="va">x</span>, linestring_id <span class="op">=</span> <span class="st">"line_id"</span>, x <span class="op">=</span> <span class="st">"x"</span>, y <span class="op">=</span> <span class="st">"y"</span>, keep <span class="op">=</span> <span class="cn">TRUE</span> <span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span>   line_id val   geometry</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 1       1   a 1, 2, 4, 3</span>
<span clas