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\name{is.multitype.lpp}
\alias{is.multitype.lpp}
\title{Test Whether A Point Pattern on a Network is Multitype}
\description{
Tests whether a point pattern on a network has ``marks''
attached to the points which classify the points into several types.
}
\usage{
\method{is.multitype}{lpp}(X, na.action="warn", \dots)
}
\arguments{
\item{X}{
Point pattern on a linear networl
(object of class \code{"lpp"}).
}
\item{na.action}{
String indicating what to do if \code{NA} values are
encountered amongst the marks.
Options are \code{"warn"}, \code{"fatal"} and \code{"ignore"}.
}
\item{\dots}{
Ignored.
}
}
\value{
Logical value, equal to \code{TRUE} if \code{X} is a multitype point pattern.
}
\details{
``Marks'' are observations attached to each point of a point pattern.
For example the \code{\link[spatstat.data]{chicago}} dataset contains
the locations of crimes, each crime location
being marked by the type of crime.
This function tests whether the point pattern \code{X}
contains or involves marked points, \bold{and} that the
marks are a factor.
It is a method for the generic function
\code{\link[spatstat.geom]{is.multitype}}.
The argument \code{na.action} determines what action will be taken
if the point pattern has a vector of marks but some or all of the
marks are \code{NA}. Options are \code{"fatal"} to cause a fatal
error; \code{"warn"} to issue a warning and then return \code{TRUE};
and \code{"ignore"} to take no action except returning \code{TRUE}.
}
\seealso{
\code{\link[spatstat.geom]{is.multitype}},
\code{\link{is.multitype.lppm}}
}
\examples{
is.multitype(chicago)
}
\author{
\adrian
and \rolf
}
\keyword{spatial}
\keyword{manip}
\concept{Linear network}
|
