\name{density-methods}
\docType{methods}
\alias{density-methods}
\alias{density.ExpressionSet}
\alias{density,ExpressionSet-method}

\title{Density plot of a ExpressionSet object}
\description{ Creating density plot of sample intensities in a ExpressionSet object. It is equivalent to \link{hist-methods}. }

\usage{
\S4method{density}{ExpressionSet}(x, logMode=TRUE, xlab = NULL, ylab = "density", type = "l", 
	col=1:dim(x)[2], lty=1:dim(x)[2], lwd=1, xlim = NULL, index.highlight = NULL, color.highlight = 2, 
	symmetry = NULL, addLegend = TRUE, legendPos="topright", subset = NULL, main="", ...)
}

\arguments{
	\item{x}{ a \code{\link[Biobase]{ExpressionSet}} object}
	\item{logMode}{ determine whether the density plot is based on a log2 scale }
	\item{xlab}{ xlab of the density plot }
	\item{ylab}{ ylab of the density plot }
	\item{type}{ parameter of plot function }
	\item{col}{ line colors of the density plot }
	\item{lty}{ line types of the density plot }
	\item{lwd}{ line width of plot function }
	\item{xlim}{ parameter of the plot function}
	\item{index.highlight}{ the column index of the highlighted density curve }
	\item{color.highlight}{ color of highlighted density curve }
	\item{symmetry}{ the boundary position suppose to be symmetric distributed  }
	\item{addLegend}{ whether add legend to the plot or not }
	\item{legendPos}{the legend position. It can be a string specifying the position, or a length two vector specifying the x and y position. Please check \code{\link[graphics]{legend}} for more details. }
	\item{subset}{ subset of rows used to plot. It can be an index vector, or the length of a random subset}
    \item{main}{ title for the plot}
	\item{\dots}{ additional parameters for \code{\link[stats]{density}} function }
}

\seealso{
  \code{\link{LumiBatch-class}}, \link{hist-methods}, \code{\link[stats]{density}}
}
\examples{
## load example data
data(example.lumi)

density(example.lumi)
}
\keyword{methods}
\keyword{hplot}