solve.pdMat               package:nlme               R Documentation

_C_a_l_c_u_l_a_t_e _I_n_v_e_r_s_e _o_f _a _P_o_s_i_t_i_v_e-_D_e_f_i_n_i_t_e _M_a_t_r_i_x

_D_e_s_c_r_i_p_t_i_o_n:

     The positive-definite matrix represented by 'a' is inverted and
     assigned to 'a'.

_U_s_a_g_e:

     ## S3 method for class 'pdMat':
     solve(a, b, ...)

_A_r_g_u_m_e_n_t_s:

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

       b: this argument is only included for consistency with the
          generic function and is not used in this method function.

     ...: some methods for this generic require additional arguments. 
          None are used in this method.

_V_a_l_u_e:

     a 'pdMat' object similar to 'a', but with coefficients
     corresponding to the inverse of the positive-definite matrix
     represented by 'a'.

_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:

     'pdMat'

_E_x_a_m_p_l_e_s:

     pd1 <- pdCompSymm(3 * diag(3) + 1)
     solve(pd1)