CF: Central Feature (CF) Calculator
In aspace: A collection of functions for estimating centrographic statistics and computational geometries for spatial point patterns

Description Usage Arguments Details Value Note Author(s) See Also Examples

Identifies the central feature within a set of point locations.

1	CF(id=1, filename="CF_Output.txt", points=activities)

`id`	A unique integer to identify the CF
`filename`	A string indicating the ASCII textfile where the central feature coordinates will be written
`points`	A 2-column matrix or data frame containing the set of point observations

Use the cfloc (coordinates) and cfdatt(attributes) to produce shapefiles using the convert.to.shapefile and write.shapefile from the shapefiles library

The result is a list of terms:

`id`	Identifier for the central feature - it should be unique
`CF.x`	X-coordinate of the central feature
`CF.y`	Y-coordinate of the central feature

Results are stored in the r.CF object and can be passed through plotting functions. This function can also be used repetitively within a loop to compute multiple CF centres from different datasets.

Randy Bui, Ron Buliung

mean_centre, CMD, median_centre

## CF example
CF(id=1, filename="CF_Output.txt", points=activities)

## CF to shapefile example (exclude the comments below to run script)
## shp <- convert.to.shapefile(cfloc,cfatt,"id",5)
## write.shapefile(shp, "CF_Shape", arcgis=T)