'Returns the matrix, M, corresponding to the dynamic equations in
implicit form, M x\' = F, where the kinematical equations are not
included'

@property
def dyn_implicit_mat(self):

    if (self._dyn_implicit_mat is None):
        raise AttributeError('dyn_implicit_mat    is    not    specified    for    equations    of    motion    form    [1]    or    [2].')
    else:
        return self._dyn_implicit_mat
