logDet.pdMat              package:nlme              R Documentation

_E_x_t_r_a_c_t _L_o_g-_D_e_t_e_r_m_i_n_a_n_t _f_r_o_m _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 logarithm of the determinant of
     a square-root factor of the positive-definite matrix represented
     by 'object'.

_U_s_a_g_e:

     ## S3 method for class 'pdMat':
     logDet(object, ...)

_A_r_g_u_m_e_n_t_s:

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

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

_V_a_l_u_e:

     the log-determinant of a square-root factor of the
     positive-definite matrix represented by 'object'.

_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 <- pdSymm(diag(1:3))
     logDet(pd1)

