pdFactor                package:lme4                R Documentation

_S_q_u_a_r_e-_r_o_o_t _f_a_c_t_o_r

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

     This generic function extracts the square-root factor of the
     positive-definite matrix represented by `object'. Letting S denote
     a positive-definite matrix, a square-root factor of S is any
     square matrix L such that S = L'L. This function extracts L.

     This function is deprecated.  Use coersion to the `pdfactor' class
     instead.

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

     pdFactor(object)

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

  object: an object inheriting from class `pdMat', representing a
          positive definite matrix, which must have been initialized
          (i.e. `length(coef(object)) > 0').

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

     A `pdfactor' object.

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

     `pdMat-class', `pdfactor-class'

