\HeaderA{trellis.object}{A Trellis Plot Object}{trellis.object}
\keyword{classes}{trellis.object}
\begin{Description}\relax
This class of objects is returned by high level lattice functions, and
is usually plotted by default by its
\code{\LinkA{print}{print}} method.
\end{Description}
\begin{Details}\relax
A trellis object, as returned by high level lattice functions like
\code{\LinkA{xyplot}{xyplot}}, is a list with the \code{"class"} attribute set
to \code{"trellis"}.  Many of the components of this list are simply
the arguments to the high level function that produced the object.
Among them are: \code{as.table}, \code{layout}, \code{page},
\code{panel}, \code{prepanel}, \code{main}, \code{sub},
\code{par.strip.text}, \code{strip}, \code{skip}, \code{xlab}
\code{ylab}, \code{par.settings}, \code{lattice.options} and
\code{plot.args}.  Some other typical components are:

\describe{
\item[\code{formula}] the Trellis formula used in the call

\item[\code{index.cond}] list with index for each of the conditioning variables

\item[\code{perm.cond}] permutation of the order of the conditioning variables

\item[\code{aspect.fill}] logical, whether \code{aspect} is \code{"fill"}

\item[\code{aspect.ratio}] numeric, aspect ratio to be used if \code{aspect.fill} is
\code{FALSE}

\item[\code{call}] call that generated the object. 
\item[\code{condlevels}] list with levels of the conditioning variables

\item[\code{legend}] list describing the legend(s) to be drawn

\item[\code{panel.args}] a list as long as the number of panels, each element being a list
itself, containing the arguments in named form to be passed to the
panel function in that panel.

\item[\code{panel.args.common}] a list containing the arguments common to all the panel functions
in \code{name=value} form

\item[\code{x.scales}] list describing x-scale, can consist of several other lists,
paralleling panel.args, if x-relation is not \code{"same"}

\item[\code{y.scales}] list describing y-scale, similar to \code{x.scales}

\item[\code{x.between}] numeric vector of interpanel x-space 
\item[\code{y.between}] numeric vector of interpanel y-space 
\item[\code{x.limits}] numeric vector of length 2 or list, giving x-axis limits

\item[\code{y.limits}] similar to \code{x.limits} 
\item[\code{packet.sizes}] array recording the number of observations in each packet

}
\end{Details}
\begin{Author}\relax
Deepayan Sarkar \email{Deepayan.Sarkar@R-project.org}
\end{Author}
\begin{SeeAlso}\relax
\code{\LinkA{Lattice}{Lattice}}, \code{\LinkA{xyplot}{xyplot}},
\code{\LinkA{print.trellis}{print.trellis}}
\end{SeeAlso}

