| 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 = par("lwd"), 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. |
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.
Murrell, P. (2005) R Graphics. Chapman & Hall/CRC Press.
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)