Computes the distances between pairs of points taken from two different point patterns.
# S3 method for ppp
crossdist(X, Y, …, periodic=FALSE, method="C", squared=FALSE)Point patterns (objects of class "ppp").
Ignored.
Logical. Specifies whether to apply a periodic edge correction.
String specifying which method of calculation to use.
Values are "C" and "interpreted".
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, 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 point patterns (objects of class "ppp").
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.
The argument method is not normally used. It is
retained only for checking the validity of the software.
If method = "interpreted" then the distances are
computed using interpreted R code only. If method="C"
(the default) then C code is used.
The C code is faster by a factor of 4.
crossdist,
crossdist.default,
crossdist.psp,
pairdist,
nndist,
Gest
# NOT RUN {
data(cells)
d <- crossdist(cells, runifpoint(6))
d <- crossdist(cells, runifpoint(6), periodic=TRUE)
# }
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