grid {graphics} | R Documentation |
grid
adds an nx
by ny
rectangular grid to an
existing plot.
grid(nx = NULL, ny = nx, col = "lightgray", lty = "dotted", lwd = NULL, equilogs = TRUE)
nx,ny |
number of cells of the grid in x and y direction. When
NULL , as per default, the grid aligns with the tick marks on
the corresponding default axis (i.e., tickmarks as computed by
axTicks ). When NA , no grid lines are
drawn in the corresponding direction. |
col |
character or (integer) numeric; color of the grid lines. |
lty |
character or (integer) numeric; line type of the grid lines. |
lwd |
non-negative numeric giving line width of the grid lines;
defaults to par("lwd") . |
equilogs |
logical, only used when log coordinates and
alignment with the axis tick marks are active. Setting equilogs =
FALSE in that case gives non equidistant tick aligned
grid lines. |
If more fine tuning is required, use abline(h = ., v = .)
directly.
plot(1:3) grid(NA, 5, lwd = 2) # grid only in y-direction ## maybe change the desired number of tick marks: par(lab=c(mx,my,7)) op <- par(mfcol = 1:2) with(iris, { plot(Sepal.Length, Sepal.Width, col = as.integer(Species), xlim = c(4, 8), ylim = c(2, 4.5), panel.first = grid(), main = "with(iris, plot(...., panel.first = grid(), ..) )") plot(Sepal.Length, Sepal.Width, col = as.integer(Species), panel.first = grid(3, lty=1,lwd=2), main = "... panel.first = grid(3, lty=1,lwd=2), ..") } ) par(op)