tcrossprod              package:Matrix              R Documentation

_C_r_o_s_s-_p_r_o_d_u_c_t _o_f _t_r_a_n_s_p_o_s_e

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

     Take the cross-product of the transpose of a matrix. This is
     formally equivalent to, but faster than, the call 'x %*% t(x)'.

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

     tcrossprod(x)

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

       x: a matrix-like object

_D_e_t_a_i_l_s:

     For some classes in the 'Matrix' package, such as the
     'cscMatrix-class', it is much faster to calculate the
     cross-product of the transpose directly instead of calculating the
     transpose first and then its cross-product.

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

     An object of an appropriate symmetric matrix class.

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

     _x = "_c_s_c_M_a_t_r_i_x" method for compressed, sparse, column-oriented
          matrices.

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

     'crossprod'

