/dd>
<dt>method</dt>
<dd><p>A character string specifying the method to estimate the neighbors. It most be one of <code>"radius_search"</code> or <code>"knn"</code>.</p></dd>
<dt>radius</dt>
<dd><p>A <code>numeric</code> vector representing the radius for search to consider. This needs be used if <code>method = "radius_search"</code>.</p></dd>
<dt>k</dt>
<dd><p>An <code>integer</code> vector representing the number of neighbors to consider. This needs be used if <code>method = "knn"</code>.</p></dd>
<dt>max