expand                package:Matrix                R Documentation

_E_x_p_a_n_d _a _D_e_c_o_m_p_o_s_i_t_i_o_n _i_n_t_o _F_a_c_t_o_r_s

_D_e_s_c_r_i_p_t_i_o_n:

     Expands decompositions stored in compact form into factors.

_U_s_a_g_e:

     expand(x, ...)

_A_r_g_u_m_e_n_t_s:

       x: a matrix decomposition.

     ...: further arguments passed to or from other methods.

_D_e_t_a_i_l_s:

     This is a generic function with special methods for different
     types of decompositions, see 'showMethods(expand)' to list them
     all.

_V_a_l_u_e:

     The expanded decomposition, typically a list of matrix factors.

_N_o_t_e:

     Factors for decompositions such as 'lu' and 'qr' can be stored in
     a compact form. The function 'expand' allows all factors to be
     fully expanded.

_S_e_e _A_l_s_o:

     The LU decomposition 'lu', for which there _is_ an 'expand'
     method; 'facmul'.

_E_x_a_m_p_l_e_s:

     (x <- Matrix(round(rnorm(9),2), 3, 3))
     (ex <- expand(lux <- lu(x)))