SpatialEpi (version 1.2.8)

circle: Compute cartesian coordinates of a cluster center and radius

Description

This function is used for plotting purposes

Usage

circle(geo, cluster.center, cluster.end)

Value

cluster.radius

A data frame that you can plot

Arguments

geo

A n x 2 table of the x-coordinate and y-coordinates of the centroids of each area

cluster.center

The area index (an integer between 1 and n) indicating the center of the circle

cluster.end

The area index (an integer between 1 and n) indicating the area at the end of the circle

Author

Albert Y. Kim

Examples

data(pennLC)
geo <- pennLC$geo[,2:3]
plot(geo,type='n')
text(geo,labels=1:nrow(geo))
lines( circle(geo, 23, 46), col = "red" )