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\name{G_banking}
\alias{banking}
\title{Banking}
\description{
Calculates banking slope
}
\usage{
banking(dx, dy)
}
\arguments{
\item{dx, dy}{ vector of consecutive x, y differences. }
}
\details{
\code{banking} is the banking function used when
\code{aspect = "xy"} in high level Trellis functions. It is usually not
very meaningful except with \code{xyplot}. It considers the
absolute slopes (based on \code{dx} and \code{dy}) and returns a value
which when adjusted by the panel scale limits will make the median of
the above absolute slopes correspond to a 45 degree line.
This function was inspired by the discussion of banking in the
documentation for Trellis Graphics available at Bell Labs' website
(see \code{\link{Lattice}}), but is most likely identical to an
algorithm described by Cleveland et al (see below). It is
not clear (to the author) whether this is the algorithm used in
S-PLUS. Alternative banking rules, implemented as a similar function,
can be used as a drop-in replacement by suitably modifying
\code{lattice.options("banking")}.
}
\examples{
## with and without banking
plot <- xyplot(sunspot.year ~ 1700:1988, xlab = "", type = "l",
scales = list(x = list(alternating = 2)),
main = "Yearly Sunspots")
print(plot, position = c(0, .3, 1, .9), more = TRUE)
print(update(plot, aspect = "xy", main = "", xlab = "Year"),
position = c(0, 0, 1, .3))
## cut-and-stack plot (see also xyplot.ts)
xyplot(sunspot.year ~ time(sunspot.year) | equal.count(time(sunspot.year)),
xlab = "", type = "l", aspect = "xy", strip = FALSE,
scales = list(x = list(alternating = 2, relation = "sliced")),
as.table = TRUE, main = "Yearly Sunspots")
}
\references{
Cleveland, William S. and McGill, Marylyn E. and McGill, Robert (1988)
\dQuote{The Shape Parameter of a Two-variable Graph}, \emph{Journal of
the American Statistical Association}, \bold{83}, 289--300.
}
\author{ Deepayan Sarkar \email{Deepayan.Sarkar@R-project.org}}
\seealso{\code{\link{Lattice}}, \code{\link{xyplot}}}
\keyword{dplot}
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