

trmat(spatial)                               R Documentation

_E_v_a_l_u_a_t_e _T_r_e_n_d _S_u_r_f_a_c_e _o_v_e_r _a _G_r_i_d

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

     Evaluate trend surface over a grid.

_U_s_a_g_e_:

     trmat(obj, xl, xu, yl, yu, n)

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

     obj: object returned by `surf.ls' or `surf.gls'

      xl: limits of the rectangle for grid

      xu:

      yl:

      yu:

       n: use `n'  x  `n' grid within the rectangle

_V_a_l_u_e_:

     list with components `x', `y' and `z' suitable for
     `contour' and `image'.

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

     `surf.ls', `surf.gls'

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

     data(topo)
     topo.kr <- surf.ls(2, topo)
     trsurf <- trmat(topo.kr, 0, 6.5, 0, 6.5, 50)

