https://github.com/cran/spatstat
Tip revision: fde730248c7060410e434275bfff79f345368fa6 authored by Adrian Baddeley on 22 May 2010, 00:00:00 UTC
version 1.19-1
version 1.19-1
Tip revision: fde7302
multiplicity.ppp.Rd
\name{multiplicity.ppp}
\alias{multiplicity.ppp}
\title{Count Multiplicity of Duplicate Points}
\description{
Counts the number of duplicates for each point
in a spatial point pattern.
}
\usage{
multiplicity.ppp(x)
}
\arguments{
\item{x}{
A spatial point pattern
(object of class \code{"ppp"}).
}
}
\value{
A vector of integers (multiplicities) of length equal to the
number of points in \code{x}.
}
\details{
Two points in a point pattern are deemed to be identical
if their \eqn{x,y} coordinates are the same,
and their marks are also the same (if they carry marks).
The Examples section illustrates how it is possible for
a point pattern to contain a pair of identical points.
For each point in \code{x}, this function counts how many
points are identical to it, and returns the vector of counts.
}
\seealso{
\code{\link{ppp.object}},
\code{\link{duplicated.ppp}},
\code{\link{unique.ppp}}
}
\examples{
X <- ppp(c(1,1,0.5), c(2,2,1), window=square(3))
m <- multiplicity.ppp(X)
# unique points in X, marked by multiplicity
first <- !duplicated(X)
Y <- X[first] \%mark\% m[first]
}
\author{Adrian Baddeley
\email{adrian@maths.uwa.edu.au}
\url{http://www.maths.uwa.edu.au/~adrian/}
and Rolf Turner
\email{r.turner@auckland.ac.nz}
}
\keyword{spatial}
\keyword{utilities}