arg</code>
gives the argument value at which
the discrete values of the functional variables are observed for each row.</p></dd>


<dt>domain</dt>
<dd><p>A numeric vector of length 2 defining
the interval over which the functional data object
can be evaluated.</p></dd>


<dt>arg</dt>
<dd><p>A character variable, which is the name of
the column of the data frame <code>dt</code>
giving the argument values at which the functional variables
are evaluated for each row.</p></dd>


<dt>id</dt>
<dd><p>A character v