\HeaderA{twilight.getmatrix}{Internal function to extract the gene expression matrix from an expression set}{twilight.getmatrix}
\keyword{internal}{twilight.getmatrix}
\begin{Description}\relax
If the input object is of class \code{exprSet}, the function extracts the gene expression matrix.
\end{Description}
\begin{Usage}
\begin{verbatim}
twilight.getmatrix(xin)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{xin}] Input object of class \code{exprSet}.
\end{ldescription}
\end{Arguments}
\begin{Value}
Returns the matrix of gene expression values.
\end{Value}
\begin{Author}\relax
Stefanie Scheid \url{http://www.molgen.mpg.de/~scheid}
\end{Author}
\begin{References}\relax
Scheid S and Spang R (2004): A stochastic downhill search algorithm for estimating the local false discovery rate, \emph{IEEE TCBB} \bold{1(3)}, 98--108.
\end{References}
\begin{SeeAlso}\relax
\code{\LinkA{twilight.pval}{twilight.pval}}
\end{SeeAlso}

