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Computes the distances between pairs of points taken from two different three-dimensional point patterns.
# S3 method for pp3
crossdist(X, Y, …, periodic=FALSE, squared=FALSE)Point patterns in three dimensions (objects of class "pp3").
Ignored.
Logical. Specifies whether to apply a periodic edge correction.
Logical. If squared=TRUE, the squared distances are
returned instead (this computation is faster).
A matrix whose [i,j] entry is the distance
from the i-th point in X
to the j-th point in Y.
Given two point patterns in three-dimensional space, this function computes the Euclidean distance from each point in the first pattern to each point in the second pattern, and returns a matrix containing these distances.
This is a method for the generic function crossdist
for three-dimensional point patterns (objects of class "pp3").
This function expects two
point patterns X and Y, and returns the matrix
whose [i,j] entry is the distance from X[i] to
Y[j].
Alternatively if periodic=TRUE, then provided the windows
containing X and Y are identical and are rectangular,
then the distances will be computed in the `periodic'
sense (also known as `torus' distance): opposite edges of the
rectangle are regarded as equivalent.
This is meaningless if the window is not a rectangle.
# NOT RUN {
X <- runifpoint3(20)
Y <- runifpoint3(30)
d <- crossdist(X, Y)
d <- crossdist(X, Y, periodic=TRUE)
# }
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