as.matrix.reStruct           package:nlme           R Documentation

_M_a_t_r_i_c_e_s _o_f _a_n _r_e_S_t_r_u_c_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 matrices
     corresponding to the 'pdMat' elements of 'object'.

_U_s_a_g_e:

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

_A_r_g_u_m_e_n_t_s:

       x: an object inheriting from class 'reStruct', representing a
          random effects structure and consisting of a list of 'pdMat'
          objects.

     ...: further arguments passed from other methods.

_V_a_l_u_e:

     a list with components given by the positive-definite matrices
     corresponding to the elements of 'object'.

_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:

     'as.matrix.pdMat', 'reStruct', 'pdMat'

_E_x_a_m_p_l_e_s:

     rs1 <- reStruct(pdSymm(diag(3), ~age+Sex, data = Orthodont))
     as.matrix(rs1)