pdgradNumeric              package:lme4              R Documentation

_E_v_a_l_u_a_t_e _t_h_e _p_d_m_a_t_r_i_x _g_r_a_d_i_e_n_t _n_u_m_e_r_i_c_a_l_l_y

_D_e_s_c_r_i_p_t_i_o_n:

     Evaluate the pdmatrix gradient via finite differences.  This
     function is used to validate the `pdgradient' methods for `pdMat'
     classes.

_U_s_a_g_e:

     pdgradNumeric(x)

_A_r_g_u_m_e_n_t_s:

       x: A `pdMat' object

_V_a_l_u_e:

     A finite-difference approximation to the gradient of the
     `pdmatrix' represented by `x' with respect to the parameters of
     `x'.

_A_u_t_h_o_r(_s):

     Douglas Bates bates@stat.wisc.edu and Saikat DebRoy
     saikat@stat.wisc.edu

_E_x_a_m_p_l_e_s:

