sphet (version 2.0)

read.gwt2dist: Read distance ojbects

Description

The function reads "GWT" files (i.e. generated using distance. It will read also other more general formats (as for example .txt files).

Usage

read.gwt2dist(file, region.id = NULL, skip = 1)

Value

An object of class distance

Arguments

file

name of file to be read

region.id

variable that defines the ordering of the observations

skip

number of lines to skip

Author

Gianfranco Piras

Details

The first line of a 'GWT' file generally contains some information (e.g. the name of the shape file, the number of observations), in which case, skip should be equal to 1. When the file has a 'GWT' extension, the number of observations is generally retrived from the first line. Alternatively, it is fixed to the length of the unique region.id variable.

Examples

if (FALSE) {
library(spdep)
data(columbus)
dist <- read.gwt2dist(file = system.file('extdata/knn10columbus.GWT',
package = "sphet"), region.id = columbus$POLYID)
}