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\name{plotMvsA.matrix}
\alias{plotMvsA.matrix}
\alias{plotMvsA.matrix}


\title{Plot log-ratios vs log-intensities}

\description{
  Plot log-ratios vs log-intensities.
}

\usage{\method{plotMvsA}{matrix}(X, Alab="A", Mlab="M", Alim=c(0, 16), Mlim=c(-1, 1) * diff(Alim), pch=".", ..., add=FALSE)}

\arguments{
 \item{X}{Nx2 \code{\link[base]{matrix}} with two channels and N observations.}
 \item{Alab,Mlab}{Labels on the x and y axes.}
 \item{Alim,Mlim}{Plot range on the A and M axes.}
 \item{pch}{Plot symbol used.}
 \item{...}{Additional arguments accepted by \code{\link[graphics]{points}}.}
 \item{add}{If \code{\link[base:logical]{TRUE}}, data points are plotted in the current plot,
   otherwise a new plot is created.}
}

\details{
 Red channel is assumed to be in column one and green in column two.
 Log-ratio are calculated taking channel one over channel two.
}

\value{
  Returns nothing.
}

\author{Henrik Bengtsson (\url{http://www.braju.com/R/})}
\keyword{methods}