grid
Add Grid to a Plot
grid adds an nx by ny rectangular grid to an
existing plot.
- Keywords
- aplot
Usage
grid(nx = NULL, ny = nx, col = "lightgray", lty = "dotted",
lwd = par("lwd"), equilogs = TRUE)Arguments
- 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 byaxTicks). WhenNA, 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 = FALSEin that case gives non equidistant tick aligned grid lines.
Note
If more fine tuning is required, use abline(h = ., v = .)
directly.
References
Murrell, P. (2005) R Graphics. Chapman & Hall/CRC Press.
See Also
Examples
library(graphics)
# NOT RUN {
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)
# }