needUpdate               package:nlme               R Documentation

_C_h_e_c_k _i_f _U_p_d_a_t_e _i_s _N_e_e_d_e_d

_D_e_s_c_r_i_p_t_i_o_n:

     This function is generic; method functions can be written 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.

_U_s_a_g_e:

     needUpdate(object)

_A_r_g_u_m_e_n_t_s:

  object: any object

_V_a_l_u_e:

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

_A_u_t_h_o_r(_s):

     Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates
     bates@stat.wisc.edu

_S_e_e _A_l_s_o:

     'needUpdate.modelStruct'

_E_x_a_m_p_l_e_s:

     vf1 <- varExp()
     vf1 <- Initialize(vf1, data = Orthodont)
     needUpdate(vf1)