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\name{F_3_prepanel.functions}
\alias{prepanel.lmline}
\alias{prepanel.loess}
\alias{prepanel.spline}
\alias{prepanel.qqmathline}
\title{ Useful Prepanel Function for Lattice}
\description{
These are predefined prepanel functions available in Lattice.
}
\usage{
prepanel.lmline(x, y, \dots)
prepanel.qqmathline(x, y = x, distribution = qnorm,
probs = c(0.25, 0.75), qtype = 7,
groups, subscripts,
\dots)
prepanel.loess(x, y, span, degree, family, evaluation,
horizontal = FALSE, \dots)
prepanel.spline(x, y, npoints = 101,
horizontal = FALSE, \dots,
keep.data = FALSE)
}
\arguments{
\item{x, y}{x and y values, numeric or factor}
\item{distribution}{ quantile function for theoretical
distribution. This is automatically passed in when this is used as a
prepanel function in \code{qqmath}.
}
\item{qtype}{ type of \code{\link{quantile}}}
\item{probs}{
numeric vector of length two, representing probabilities. If used
with \code{aspect="xy"}, the aspect ratio will be chosen to make the
line passing through the corresponding quantile pairs as close to 45
degrees as possible.
}
\item{span, degree, family, evaluation}{ Arguments controlling the
underlying \code{\link{loess}} smooth. }
\item{horizontal, npoints}{ See documentation for corresponding panel
function.
}
\item{keep.data}{ Ignored. Present to capture argument of the same
name in \code{\link{smooth.spline}}. }
\item{groups, subscripts}{ See \code{\link{xyplot}}. Whenever
appropriate, calculations are done separately for each group and
then combined. }
\item{\dots}{ Other arguments. These are passed on to other functions
if appropriate (in particular, \code{\link{smooth.spline}}), and
ignored otherwise. }
}
\details{
All these prepanel functions compute the limits to be large enough to
contain all points as well as the relevant smooth.
In addition, \code{prepanel.lmline} computes the \code{dx} and
\code{dy} such that it reflects the slope of the linear regression
line; for \code{prepanel.qqmathline}, this is the slope of the line
passing through the quantile pairs specified by \code{probs}. For
\code{prepanel.loess} and \code{prepanel.spline}, \code{dx} and
\code{dy} reflect the piecewise slopes of the nonlinear smooth.
}
\value{
usually a list with components \code{xlim}, \code{ylim}, \code{dx} and
\code{dy}, the first two being used to calculate panel axes limits,
the last two for banking computations. The form of these components
are described under \code{\link{xyplot}}. There are also several
prepanel functions that serve as the default for high level functions,
see \code{\link{prepanel.default.xyplot}}
}
\seealso{
\link{Lattice}, \code{\link{xyplot}}, \code{\link{banking}},
\code{\link{panel.loess}}, \code{\link{panel.spline}}.
}
\author{ Deepayan Sarkar \email{Deepayan.Sarkar@R-project.org}}
\keyword{dplot}
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