https://github.com/cran/spatstat
Tip revision: 69b35c354f273225779b6df5579298f44ae146a2 authored by Adrian Baddeley on 23 February 2006, 16:11:58 UTC
version 1.8-6
version 1.8-6
Tip revision: 69b35c3
pairdist.ppp.Rd
\name{pairdist.ppp}
\alias{pairdist.ppp}
\title{Pairwise distances}
\description{
Computes the matrix of distances between all pairs of points
in a point pattern.
}
\usage{
pairdist.ppp(X, \dots, method="C")
}
\arguments{
\item{X}{
A point pattern (object of class \code{"ppp"}).
}
\item{\dots}{
Ignored.
}
\item{method}{
String specifying which method of calculation to use.
Values are \code{"C"} and \code{"interpreted"}.
Usually not specified.
}
}
\value{
A square matrix whose \code{[i,j]} entry is the distance
between the points numbered \code{i} and \code{j}.
}
\details{
This is a method for the generic function \code{pairdist}.
Given a point pattern \code{X} (an object of class \code{"ppp"}),
this function computes the Euclidean distances between all pairs of
points in \code{X}, and returns the matrix of distances.
The argument \code{method} is not normally used. It is
retained only for checking the validity of the software.
If \code{method = "interpreted"} then the distances are
computed using interpreted R code only. If \code{method="C"}
(the default) then C code is used. The C code is somewhat faster.
}
\seealso{
\code{\link{pairdist}},
\code{\link{pairdist.default}},
\code{\link{pairdist.psp}},
\code{\link{crossdist}},
\code{\link{nndist}},
\code{\link{Kest}}
}
\examples{
data(cells)
d <- pairdist(cells)
}
\author{Pavel Grabarnik
\email{pavel.grabar@issp.serpukhov.su}
and
Adrian Baddeley
\email{adrian@maths.uwa.edu.au}
\url{http://www.maths.uwa.edu.au/~adrian/}
}
\keyword{spatial}