cubic splines.</p></dd>


<dt>basisobj</dt>
<dd><p>An object of class <code>basisfd</code> defining
the basis function expansion.
Default is <code>NULL</code>, which means that
a <code>basisfd</code> object is created by doing
<code>create.bspline.basis(rangeval = domain,
nbasis = n_basis,  norder = n_order)</code></p></dd>


<dt>Lfdobj</dt>
<dd><p>An object of class <code>Lfd</code> defining a
linear differential operator of order m.
It is used to specify a roughness penalty through <code>fdPar</code>.
Alt