Relative Position Coordinates — add_rel_pos

This function calculates the x and y coordinates of a neighbor in the reference frame of the focal individual.

Usage

add_rel_pos_coords(data, focal_heading = c(0, 1))

data: Dataframe with the bearing angle and distance of each individual to specific neighbors. Column names must include: bangl, nnd.
focal_heading: The heading of the focal individual, default = c(0,1) for plotting neighbor heading north.

The input dataframe with additional nnx (nearest neighbor x coordinate) and nny (nearest neighbor y coordinate) columns.


data <- data.frame(
bangl = runif(25, 0, pi),
nnd = runif(25)
)
data <- add_rel_pos_coords(data)