SpatialEpi: circle – R documentation

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circle

Compute cartesian coordinates of a cluster center and radius

This function is used for plotting purposes

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

`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

cluster.radius

A data frame that you can plot

Albert Y. Kim

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

Methods and Data for Spatial Epidemiology

v1.2.3

GPL-2

Authors

Cici Chen [ctb], Albert Y. Kim [aut, cre], Michelle Ross [ctb], Jon Wakefield [aut]

Initial release