Add Grid to a Plot

Usage

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

Arguments

nx,ny number of cells of the grid in x and y direction. Defaults to the number of tick marks on the corresponding axis.
col character or (integer) numeric; color of the grid lines.
lty character or (integer) numeric; line type of the grid lines.

Description

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

If more fine tuning is required, use abline(h = ., v = .) directly.

See Also

plot, abline, lines, points.

Examples

data(iris)
## maybe change the desired number of tick marks:  par(lab=c(mx,my,7))
plot(iris$Sepal.L, iris$Sepal.W, col = rep(1:3, rep(50, 3)),
     xlim = c(4, 8), ylim = c(2, 4.5), panel.first = grid())

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