https://github.com/cran/spatstat
Tip revision: 798bc7e8e0cd94461885e8180bfe899f8c1c78b9 authored by Adrian Baddeley on 31 March 2006, 05:34:29 UTC
version 1.8-8
version 1.8-8
Tip revision: 798bc7e
subset.fv.Rd
\name{subset.fv}
\alias{subset.fv}
\alias{[.fv}
\title{Extract Subset of Function Values}
\description{
Extract a subset of an object of class \code{"fv"}.
}
\synopsis{
subset.fv(x, i, j, \dots, drop=FALSE)
}
\usage{
subset.fv(x, i, j, drop=FALSE)
x[i, j]
}
\arguments{
\item{x}{
a function value object,
of class \code{"fv"} (see \code{\link{fv.object}}).
Essentially a data frame.
}
\item{i}{
any appropriate subset index.
Selects a subset of the rows of the data frame, i.e.
a subset of the domain of the function(s) represented by \code{x}.
}
\item{j}{
any appropriate subset index for the columns of the data frame.
Selects some of the functions present in \code{x}.
}
\item{\dots}{
Ignored - this argument is required for consistency with other
methods for \code{"["}.
}
\item{drop}{
Ignored - this argument is required for consistency with other
methods for \code{"["}.
}
}
\value{
A function value object (of class \code{"fv"}).
}
\details{
This is a method for \code{"["} for the class \code{"fv"}.
It is very similar to \code{\link{[.data.frame}}
except for a few extra checks on the sanity of the result.
}
\seealso{
\code{\link{fv.object}}
}
\examples{
data(cells)
K <- Kest(cells)
# discard the estimates of K(r) for r > 0.1
Ksub <- K[K$r <= 0.1, ]
# discard the border method estimator
Ksub <- K[ , names(K) != "border"]
}
\author{Adrian Baddeley
\email{adrian@maths.uwa.edu.au}
\url{http://www.maths.uwa.edu.au/~adrian/}
and Rolf Turner
\email{rolf@math.unb.ca}
\url{http://www.math.unb.ca/~rolf}
}
\keyword{spatial}