="va">...</span><span class="op">)</span></span></code></pre></div>
    </div>

    <div class="section level2">
    <h2 id="arguments">Arguments<a class="anchor" aria-label="anchor" href="#arguments"></a></h2>


<dl><dt id="arg-p-">p1<a class="anchor" aria-label="anchor" href="#arg-p-"></a></dt>
<dd><p>an ob_point of length 1 or length 3</p></dd>


<dt id="arg-p-">p2<a class="anchor" aria-label="anchor" href="#arg-p-"></a></dt>
<dd><p>an ob_point of length 1 or NULL</p></dd>


<dt id="arg-p-">p3<a class="a