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\name{scale_discrete}
\alias{scale_discrete}
\alias{scale_x_discrete}
\alias{scale_y_discrete}
\alias{scale_z_discrete}
\alias{ScaleDiscretePosition}
\title{scale\_discrete}
\description{Discrete position scale}
\details{
This page describes scale\_discrete, see \code{\link{layer}} and \code{\link{qplot}} for how to create a complete plot from individual components.
}
\usage{scale_x_discrete(name = NULL, expand = c(0.05, 0.55), limits = NULL,
breaks = NULL, labels = NULL, formatter = identity, drop = FALSE,
legend = TRUE, ...)}
\arguments{
\item{name}{name of scale to appear in legend or on axis. Maybe be an expression: see ?plotmath}
\item{expand}{numeric vector of length 2, giving multiplicative and additive expansion factors}
\item{limits}{numeric vector of length 2, giving the extent of the scale}
\item{breaks}{numeric vector indicating where breaks should lie}
\item{labels}{character vector giving labels associated with breaks}
\item{formatter}{NULL}
\item{drop}{NULL}
\item{legend}{NULL}
\item{...}{ignored }
}
\seealso{\itemize{
\item \url{http://had.co.nz/ggplot2/scale_discrete.html}
}}
\value{A \code{\link{layer}}}
\examples{\dontrun{
qplot(cut, data=diamonds, stat="bin")
qplot(cut, data=diamonds, geom="bar")
# The discrete position scale is added automatically whenever you
# have a discrete position.
(d <- qplot(cut, clarity, data=subset(diamonds, carat > 1), geom="jitter"))
d + scale_x_discrete("Cut")
d + scale_x_discrete("Cut", labels = c("Fair" = "F","Good" = "G",
"Very Good" = "VG","Perfect" = "P","Ideal" = "I"))
d + scale_y_discrete("Clarity")
d + scale_x_discrete("Cut") + scale_y_discrete("Clarity")
# Use limits to adjust the which levels (and in what order)
# are displayed
d + scale_x_discrete(limits=c("Fair","Ideal"))
# you can also use the short hand functions xlim and ylim
d + xlim("Fair","Ideal", "Good")
d + ylim("I1", "IF")
# See ?reorder to reorder based on the values of another variable
qplot(manufacturer, cty, data=mpg)
qplot(reorder(manufacturer, cty), cty, data=mpg)
qplot(reorder(manufacturer, displ), cty, data=mpg)
# Use abbreviate as a formatter to reduce long names
qplot(reorder(manufacturer, cty), cty, data=mpg) +
scale_x_discrete(formatter = "abbreviate")
}}
\author{Hadley Wickham, \url{http://had.co.nz/}}
\keyword{hplot}
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