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\name{scale_alpha_continuous}
\alias{scale_alpha_continuous}
\alias{ScaleAlphaContinuous}
\alias{scale_alpha}
\title{scale\_alpha\_continuous}
\description{Alpha scale for continuous variable}
\details{
This page describes scale\_alpha\_continuous, see \code{\link{layer}} and \code{\link{qplot}} for how to create a complete plot from individual components.
}
\usage{scale_alpha_continuous(name = NULL, limits = NULL, breaks = NULL,
labels = NULL, trans = NULL, to = c(0.1, 1), legend = TRUE,
...)}
\arguments{
\item{name}{name of scale to appear in legend or on axis. Maybe be an expression: see ?plotmath}
\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{trans}{a transformer to use}
\item{to}{numeric vector of length 2, giving minimum and maximum after transformation}
\item{legend}{NULL}
\item{...}{ignored }
}
\seealso{\itemize{
\item \code{\link{scale_discrete}}: Discrete position scales
\item \url{http://had.co.nz/ggplot2/scale_alpha_continuous.html}
}}
\value{A \code{\link{layer}}}
\examples{\dontrun{
(p <- qplot(mpg, cyl, data=mtcars, alpha=cyl))
p + scale_alpha("cylinders")
p + scale_alpha("number\nof\ncylinders")
p + scale_alpha(to = c(0.4, 0.8))
}}
\author{Hadley Wickham, \url{http://had.co.nz/}}
\keyword{hplot}
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