

_A_d_d _G_r_i_d _t_o _a _P_l_o_t

     grid(nx = 3, ny = 3, col = "lightgray", lty = "dotted")

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

     `grid' adds an `nx' by `ny' rectangular grid to an
     existing plot, using lines of type `lty' and color
     `col'.

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

     `plot', `lines', `points'.

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

     data(iris)
     plot(iris$Sepal.L, iris$Sepal.W, col = rep(1:3, rep(50, 3)),
          xlim = c(4, 8), ylim = c(2, 4.5))
     grid(4, 5, lty = "solid")

