https://github.com/cran/spatstat
Tip revision: 80e2bf6554e41a2e631d507470867f9586310633 authored by Adrian Baddeley on 10 January 2019, 15:30:04 UTC
version 1.58-2
version 1.58-2
Tip revision: 80e2bf6
ssf.Rd
\name{ssf}
\alias{ssf}
\title{
Spatially Sampled Function
}
\description{
Create an object that represents a spatial function
which has been evaluated or sampled at an irregular set of points.
}
\usage{
ssf(loc, val)
}
\arguments{
\item{loc}{
The spatial locations at which the function has been evaluated.
A point pattern (object of class \code{"ppp"}).
}
\item{val}{
The function values at these locations.
A numeric vector with one entry for each point of \code{loc},
or a data frame with one row for each point of \code{loc}.
}
}
\details{
An object of class \code{"ssf"} represents a real-valued or
vector-valued function that has been evaluated or sampled at an
irregular set of points. An example would be a spatial covariate
that has only been measured at certain locations.
An object of this class also inherits the class \code{"ppp"},
and is essentially the same as a marked point pattern, except
for the class membership which enables it to be
handled in a different way.
There are methods for \code{plot}, \code{print} etc; see
\code{\link{plot.ssf}} and \code{\link{methods.ssf}}.
Use \code{\link[spatstat]{unmark}} to extract only the point
locations, and \code{\link{marks.ssf}} to extract only the function values.
}
\value{
Object of class \code{"ssf"}.
}
\author{
\adrian
}
\seealso{
\code{\link{plot.ssf}},
\code{\link{methods.ssf}},
\code{\link{Smooth.ssf}},
\code{\link{with.ssf}},
\code{\link{[.ssf}}.
}
\examples{
ssf(cells, nndist(cells, k=1:3))
}
\keyword{spatial}
\keyword{datagen}