

   CChheecckk iiff UUppddaattee iiss NNeeeeddeedd

        needUpdate(object)

   AArrgguummeennttss::

     object: any object

   DDeessccrriippttiioonn::

        This function is generic; method functions can be writ-
        ten to handle specific classes of objects. By default,
        it tries to extract a `needUpdate' attribute of
        `object'. If this is `NULL' or `FALSE' it returns
        `FALSE'; else it returns `TRUE'.  Updating of objects
        usually takes place in iterative algorithms in which
        auxiliary quantities associated with the object, and
        not being optimized over, may change.

   VVaalluuee::

        a logical value indicating whether `object' needs to be
        updated.

   AAuutthhoorr((ss))::

        Jose Pinheiro and Douglas Bates

   EExxaammpplleess::

        library(lme)
        data(Orthodont)
        vf1 <- varExpon()
        vf1 <- initialize(vf1, data = Orthodont)
        needUpdate(vf1)

