# mean_centre: Mean Centre Calculator In aspace: A collection of functions for estimating centrographic statistics and computational geometries for spatial point patterns

## Description

Compute the mean centre from a series of point locations.

## Usage

 ```1 2``` ```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

## Details

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

## 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

## Note

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

## Author(s)

Randy Bui, Ron Buliung

## See Also

`median_centre`, `CMD`, `CF`

## Examples

 ```1 2 3 4 5 6 7``` ```## 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) ```

### Example output

```Loading required package: splancs
Loading required package: sp

Spatial Point Pattern Analysis Code in S-Plus

Version 2 - Spatial and Space-Time analysis

Loading required package: Hmisc
Loading required package: lattice
Loading required package: survival
Loading required package: Formula
Loading required package: ggplot2

Attaching package: 'Hmisc'

The following object is masked from 'package:splancs':

zoom

The following objects are masked from 'package:base':

format.pval, units

Loading required package: shapefiles
Loading required package: foreign

Attaching package: 'shapefiles'

The following objects are masked from 'package:foreign':

read.dbf, write.dbf

id CENTRE.x CENTRE.y
1  1 610941.3  4830837
```

aspace documentation built on May 2, 2019, 6:24 a.m.