aspace (version 3.2)

mean_centre: Mean Centre Calculator

Description

Compute the mean centre from a series of point locations.

Usage

mean_centre(id=1, filename="mean_centre_Output.txt", 
weighted=FALSE, weights=NULL, points=activities)

Arguments

id

A unique integer to identify the mean centre

filename

A string indicating the ASCII textfile where centre coordinates will be written

weighted

Boolean: Set to TRUE if the weighted mean center is to be computed with weighted coordinates

weights

Weights applied to point observations, number of weights should equal the number of observations

points

A 2-column matrix or data frame containing the set of point observations

Value

The result is a list of terms:

id

Identifier for the mean centre - it should be unique

weighted

Boolean: TRUE if the weighted mean centre is to be used instead

weights

Weights applied to point observations

CENTRE.x

X-coordinate of the mean centre

CENTRE.y

Y-coordinate of the mean centre

Details

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

See Also

median_centre, CMD, CF

Examples

## Mean centre example
mean_centre(id=1, filename="mean_centre_Output.txt", 
weighted=FALSE, weights=NULL, points=activities)

## Mean centre to shapefile example (exclude the comments below to run script)
## shp <- convert.to.shapefile(meanloc,meanatt,"id",5)
## write.shapefile(shp, "Mean_Shape", arcgis=T)