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\name{sizeplot}
\alias{sizeplot}
\title{Plot with repeated symbols by size}
\description{
Plots a set of (x,y) data with repeated points denoted by larger
symbol sizes
}
\usage{
sizeplot(x, y, scale=1, pow=0.5, powscale=TRUE, size=c(1,4), add=FALSE, ...)
}
\arguments{
\item{x}{x coordinates of data}
\item{y}{y coordinates of data}
\item{scale}{scaling factor for size of symbols}
\item{pow}{power exponent for size of symbols}
\item{powscale}{(logical) use power scaling for symbol size?}
\item{size}{(numeric vector) min and max size for scaling, if powscale=FALSE}
\item{add}{(logical) add to an existing plot?}
\item{\dots}{other arguments to \samp{plot()} or \samp{points()}}
}
\details{
Most useful for plotting (e.g.) discrete data, where repeats are
likely. If all points are repeated equally, gives a warning. The
size of a point is given by \eqn{scale*n^pow}, where n is the number of
repeats, if powscale is TRUE, or it is scaled between size[1] and size[2],
if powscale is FALSE.
}
\value{
A plot is produced on the current device, or points are added to the
current plot if \samp{add=TRUE}.
}
\author{Ben Bolker}
\seealso{\link{symbols}}
\examples{
x <- c(0.1,0.1,0.1,0.1,0.1,0.2,0.2,0.2,0.2,0.3,0.3)
y <- c( 1, 1, 1, 1, 2, 2, 2, 3, 3, 4, 5 )
plot(x,y)
sizeplot(x,y)
sizeplot(x,y,pch=2)
}
\keyword{hplot}
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