sparseMatrix-class          package:Matrix          R Documentation

_V_i_r_t_u_a_l _C_l_a_s_s "_s_p_a_r_s_e_M_a_t_r_i_x" - _M_o_t_h_e_r _o_f _S_p_a_r_s_e _M_a_t_r_i_c_e_s

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

     Virtual Mother Class of All Sparse Matrices

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

     'Dim', and 'Dimnames', see 'Matrix-class'.

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

     Class '"Matrix"', directly.

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

     _s_h_o_w 'signature(object = "sparseMatrix")': The 'show' method for
          sparse matrices prints _"structural"_ zeroes as '"."' or
          blank.

_N_o_t_e:

     In method selection for multiplication operations (i.e. '%*%' and
     the two-argument form of 'crossprod')  the sparseMatrix class
     takes precedence in the sense that if one operand is a sparse
     matrix and the other is any type of dense matrix then the dense
     matrix is coerced to a 'dgeMatrix' and the appropriate sparse
     matrix method is used.

_E_x_a_m_p_l_e_s:

     showClass("sparseMatrix") ## and look at the help() of its subclasses

