qr-methods              package:Matrix              R Documentation

_Q_R _D_e_c_o_m_p_o_s_i_t_i_o_n - _S_4 _M_e_t_h_o_d_s _a_n_d _G_e_n_e_r_i_c

_D_e_s_c_r_i_p_t_i_o_n:

     The '"Matrix"' package provides methods for the QR decomposition
     of special classes of matrices.  There is a generic function which
     uses 'qr' as default, but methods defined in this package can take
     extra arguments.  In particular there is an option for determining
     a fill-reducing permutation of the columns of a sparse,
     rectangular matrix.

_M_e_t_h_o_d_s:


     _x = "_d_g_C_M_a_t_r_i_x" QR decomposition of a general sparse
          double-precision matrix with 'nrow(x) >= ncol(x)'.  Returns
          an object of class '"sparseQR"', see 'sparseQR'.

     _x = "_s_p_a_r_s_e_M_a_t_r_i_x" works via '"dgCMatrix"'.

_S_e_e _A_l_s_o:

     'qr', 'sparseQR', 'dgCMatrix'