ass="modifier"></span> <span class="kind">def</span></span> <span class="symbol"><span class="name">add</span><span class="params">(<span name="first">first: <a href="../../scala/index.html#Vector[+A]=scala.collection.immutable.Vector[A]" name="scala.Vector" id="scala.Vector" class="extmbr">Vector</a>[<span name="scala.Double" class="extype">Double</span>]</span>, <span name="second">second: <a href="../../scala/index.html#Vector[+A]=scala.collection.immutable.Vector[A]" name="scala.Vector" id="scala.Vector