delaunayDistance: Distance on Delaunay Triangulation

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

View source: R/deldir.R

Description

Computes the graph distance in the Delaunay triangulation of a point pattern.

Usage

1

Arguments

X

Spatial point pattern (object of class "ppp").

Details

The Delaunay triangulation of a spatial point pattern X is defined as follows. First the Dirichlet/Voronoi tessellation of X computed; see dirichlet. Then two points of X are defined to be Delaunay neighbours if their Dirichlet/Voronoi tiles share a common boundary. Every pair of Delaunay neighbours is joined by a straight line.

The graph distance in the Delaunay triangulation between two points X[i] and X[j] is the minimum number of edges of the Delaunay triangulation that must be traversed to go from X[i] to X[j].

This command returns a matrix D such that D[i,j] is the graph distance between X[i] and X[j].

Value

A symmetric square matrix with integer entries.

Author(s)

\adrian \rolf

and \ege

See Also

delaunay, delaunayNetwork

Examples

1
2
3
4
  X <- runifpoint(20)
  M <- delaunayDistance(X)
  plot(delaunay(X), lty=3)
  text(X, labels=M[1, ], cex=2)

Example output

Loading required package: nlme
Loading required package: rpart

spatstat 1.52-1       (nickname: 'Apophenia') 
For an introduction to spatstat, type 'beginner' 


Note: R version 3.4.1 (2017-06-30) is more than 9 months old; we strongly recommend upgrading to the latest version

     PLEASE NOTE:  The components "delsgs" and "summary" of the
 object returned by deldir() are now DATA FRAMES rather than
 matrices (as they were prior to release 0.0-18).
 See help("deldir").
 
     PLEASE NOTE: The process that deldir() uses for determining
 duplicated points has changed from that used in version
 0.0-9 of this package (and previously). See help("deldir").

spatstat documentation built on Aug. 4, 2018, 1:04 a.m.