pdfactor-class             package:lme4             R Documentation

_F_a_c_t_o_r_s _o_f _p_o_s_i_t_i_v_e-_d_e_f_i_n_i_t_e _m_a_t_r_i_c_e_s

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

     If S is a positive-definite matrix then any square matrix L such
     that S = L'L is said to be a square-root factor of S.  The
     `pdfactor' class is the class of such matrices.

_O_b_j_e_c_t_s _f_r_o_m _t_h_e _C_l_a_s_s:

     Objects can be created by calls of the form `new("pdfactor",
     ...)'.  More frequently they are created by coercing a `pdMat' or
     `pdmatrix' object to the `pdfactor' class.

_S_l_o_t_s:

     `._D_a_t_a': `"matrix"': the factor itself, a numeric, square matrix

     `_l_o_g_D_e_t': `"numeric"': the logarithm of the absolute value of the
          determinant of the factor.

_E_x_t_e_n_d_s:

     Class `"matrix"', from data part. Class `"structure"', by class
     "matrix". Class `"array"', by class "matrix". Class `"vector"', by
     class "matrix".

_M_e_t_h_o_d_s:

     _c_o_e_r_c_e `signature(from = "pdIdent", to = "pdfactor")': extract the
          pdfactor from a `pdIdent' object.

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

     `pdMat-class', `pdmatrix-class'

