NULL, then this provides the grid of values
over which the optimal smoothing parameter is
searched. Default value is <code>10^seq(-10,1,l=20)</code>.</p></dd>


<dt>ncores</dt>
<dd><p>If you want parallelization, give the number of cores/threads
to be used when doing GCV separately on all observations.</p></dd>

</dl></div>
    <div id="value">
    <h2>Value</h2>
    

<p>An object of class <code>mfd</code>.
See also <code><a href="mfd.html">?mfd</a></code> for additional details on the
multivariate functio