grid(nx = 3, ny = 3, col = "lightgray", lty = "dotted")
grid
adds an nx
by ny
rectangular grid to an
existing plot, using lines of type lty
and color col
.plot
, lines
, points
.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")