Smooth.fv.Rd
\name{Smooth.fv}
\alias{Smooth.fv}
\title{
Apply Smoothing to Function Values
}
\description{
Applies smoothing to the values
in selected columns of a function value table.
}
\usage{
\method{Smooth}{fv}(X, which = "*", ...,
method=c("smooth.spline", "loess"),
xinterval=NULL)
}
\arguments{
\item{X}{
Values to be smoothed.
A function value table (object of class \code{"fv"},
see \code{\link{fv.object}}).
}
\item{which}{
Character vector identifying which columns of the table
should be smoothed. Either a vector containing names
of columns, or one of the wildcard strings \code{"*"} or \code{"."}
explained below.
}
\item{\dots}{
Extra arguments passed to \code{\link[stats]{smooth.spline}}
or \code{\link[stats]{loess}} to control the smoothing.
}
\item{method}{
Smoothing algorithm. A character string, partially matched
to either \code{"smooth.spline"} or \code{"loess"}.
}
\item{xinterval}{
Optional. Numeric vector of length 2 specifying a range of
\eqn{x} values. Smoothing will be performed only on the part of the
function corresponding to this range.
}
}
\details{
The command \code{Smooth.fv}
applies smoothing to the function values in
a function value table (object of class \code{"fv"}).
\code{Smooth.fv} is a method for the generic function
\code{\link{Smooth}}.
The smoothing is performed either by
\code{\link[stats]{smooth.spline}} or by
\code{\link[stats]{loess}}.
Smoothing is applied to every column
(or to each of the selected columns) of function values in turn,
using the function argument as the \eqn{x} coordinate
and the selected column as the \eqn{y} coordinate.
The original function values are then replaced by the corresponding
smooth interpolated function values.
The optional argument \code{which} specifies which of the
columns of function values in \code{x} will be smoothed.
The default (indicated by the wildcard \code{which="*"})
is to smooth all function values, i.e.\ all columns except the
function argument. Alternatively \code{which="."} designates
the subset of function values that are displayed in the default plot.
Alternatively \code{which} can be a character vector containing the
names of columns of \code{x}.
If the argument \code{xinterval} is given, then
smoothing will be performed only in the specified range
of \eqn{x} values.
}
\value{
Another function value table (object of class \code{"fv"})
of the same format.
}
\author{\adrian
and \rolf
}
\seealso{
\code{\link{Smooth}},
\code{\link{with.fv}},
\code{\link{fv.object}},
\code{\link[stats]{smooth.spline}},
\code{\link[stats]{smooth.spline}}
}
\examples{
data(cells)
G <- Gest(cells)
plot(G)
plot(Smooth(G, df=9), add=TRUE)
}
\keyword{spatial}
\keyword{nonparametric}