pairdist.pp3

0th

Percentile

Pairwise distances in Three Dimensions

Computes the matrix of distances between all pairs of points in a three-dimensional point pattern.

Keywords
spatial, math
Usage
## S3 method for class 'pp3':
pairdist(X, \dots, periodic=FALSE, squared=FALSE)
Arguments
X
A point pattern (object of class "pp3").
...
Ignored.
periodic
Logical. Specifies whether to apply a periodic edge correction.
squared
Logical. If squared=TRUE, the squared distances are returned instead (this computation is faster).
Details

This is a method for the generic function pairdist.

Given a three-dimensional point pattern X (an object of class "pp3"), this function computes the Euclidean distances between all pairs of points in X, and returns the matrix of distances.

Alternatively if periodic=TRUE and the window containing X is a box, then the distances will be computed in the `periodic' sense (also known as `torus' distance): opposite faces of the box are regarded as equivalent. This is meaningless if the window is not a box.

If squared=TRUE then the squared Euclidean distances $d^2$ are returned, instead of the Euclidean distances $d$. The squared distances are faster to calculate, and are sufficient for many purposes (such as finding the nearest neighbour of a point).

Value

  • A square matrix whose [i,j] entry is the distance between the points numbered i and j.

See Also

pairdist, crossdist, nndist, K3est

Aliases
  • pairdist.pp3
Examples
X <- runifpoint3(20)
   d <- pairdist(X)
   d <- pairdist(X, periodic=TRUE)
   d <- pairdist(X, squared=TRUE)
Documentation reproduced from package spatstat, version 1.25-1, License: GPL (>= 2)

Community examples

Looks like there are no examples yet.