2, -1, 3},</li><li>rTake = {0, 1, 2, 3, -1},</li><li>index = Index(0, 1, 2, 3, 4).</li></ul><p>These indexers are then amenable to using with <a href="../array/package.html#take[T](arr:Array[T],offsets:Array[Int],missing:=&gt;T)(implicitevidence$4:org.saddle.ST[T]):Array[T]" class="extmbr" name="org.saddle.array#take">org.saddle.array.take</a> to
select elements out of an indexed data structure.</p><p>A performance optimization is to make lTake and rTake of type Option[Array],
where we make a value of None 