as.matrix.pdMat             package:nlme             R Documentation

_M_a_t_r_i_x _o_f _a _p_d_M_a_t _O_b_j_e_c_t

_D_e_s_c_r_i_p_t_i_o_n:

     This method function extracts the positive-definite matrix
     represented by 'x'.

_U_s_a_g_e:

     ## S3 method for class 'pdMat':
     as.matrix(x, ...)

_A_r_g_u_m_e_n_t_s:

       x: an object inheriting from class 'pdMat', representing a
          positive-definite matrix.

     ...: further arguments passed from other methods.

_V_a_l_u_e:

     a matrix corresponding to the positive-definite matrix represented
     by 'x'.

_A_u_t_h_o_r(_s):

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

_R_e_f_e_r_e_n_c_e_s:

     Pinheiro, J. C. and Bates, D. M. (2000), _Mixed-Effects Models in
     S and S-PLUS_, Springer, New York.

_S_e_e _A_l_s_o:

     'pdMat', 'corMatrix'

_E_x_a_m_p_l_e_s:

     as.matrix(pdSymm(diag(4)))

