Pairwise distances in Three Dimensions
Computes the matrix of distances between all pairs of points in a three-dimensional point pattern.
## S3 method for class 'pp3' pairdist(X, ..., periodic=FALSE, squared=FALSE)
X |
A point pattern (object of class |
... |
Ignored. |
periodic |
Logical. Specifies whether to apply a periodic edge correction. |
squared |
Logical. If |
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).
A square matrix whose [i,j] entry is the distance
between the points numbered i and j.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
based on two-dimensional code by Pavel Grabarnik.
if(require(spatstat.core)) {
X <- runifpoint3(20)
} else {
X <- osteo$pts[[1]]
}
d <- pairdist(X)
d <- pairdist(X, periodic=TRUE)
d <- pairdist(X, squared=TRUE)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.