vech                  package:rggm                  R Documentation

_T_h_e _h_a_l_f _v_e_c_t_o_r_o_r_i_z_e_d _e_l_e_m_e_n_t_s _o_f _a _g_i_v_e_n _m_a_t_r_i_x

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

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

     vech(m, diag = TRUE)

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

       m: A symmetric matrix

    diag: a logical value. If TRUE, diag elements will be included.

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

     A 'p*(p+1)/2' x '1' matrix (a vector) obtained by stacking all
     columns of a given matrix

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

     Masashi Miyamura

_R_e_f_e_r_e_n_c_e_s:

     Jan R. Magnus and Heinz Neudecker, (1999) _Matrix Differential
     Calculus with Applications in Statistics and Econometrics_, Second
     Edition, John Wiley & Sons

_S_e_e _A_l_s_o:

     'duplication'

