Add a regular, rectangular grid to a plot at user-specified positions

Source: R/add_grid_rect_xy.R

This function adds a regular grid to a plot at positions specified by x and y vectors. This function differs from grid in which the user can specify the number of cells in each direction, but not their positions.

add_grid_rect_xy(x, y, col = "lightgrey", lwd = 1, lty = 3, ...)

Arguments

x

The x coordinates of the grid lines.
y

The y coordinates of the grid lines.
col

A numeric or character input specifying the colour of the grid lines.
lwd

A number specifying the thickness of the grid lines.
lty

A numeric or character input specifying the line type.
...

Other graphical parameters passed to arrows which is used to draw grid lines, except length which is set internally.

Value

The function adds a grid to a plot.

Author

Edward Lavender

Examples

#### Example (1)
# Plot some example data and hide axes for neatness
set.seed(1)
plot(runif(100, 0, 10), runif(100, 5, 25), xlim = c(0, 10), ylim = c(5, 25), axes = FALSE)

# Add grid at user-specified positions to aid interpretation
add_grid_rect_xy(seq(0, 10, by = 2), seq(5, 25, by = 5))

# Add axes at the end for neatness
axis(side = 1, seq(0, 10, by = 2), pos = 5); axis(side = 2, seq(5, 25, by = 5), pos = 0)