\Header{exprSet2-class}{Expression Set - class}
\keyword{classes}{exprSet2-class}
\keyword{data}{exprSet2-class}
\begin{Description}\relax
A class for storing intensity values from microarray experiments.
This class is similar to \code{\Link{exprSet}}.

This class is not yet used in the limma package but is intended to unify single-channel and log-ratio analyses of spotted microarray data in the future.\end{Description}
\begin{Section}{Slots}
\describe{
\item[expressions] \code{matrix} containing intensity data on log-2 scale.
For two-color arrays, odd columns will usually correspond to channel 1 (green) and even columns to channel 2 (red) for different arrays.
\item[weights] \code{matrix} containing non-negative quality weights
\item[targets] \code{data.frame} containing factors corresponding to the columns of \code{expressions}
\item[probes] \code{data.frame} containing gene IDs or annotation information.
Should have same number of rows as \code{expression}
\item[printer] \code{list} containing information about the printing process
\item[notes] \code{character}
}\end{Section}
\begin{Section}{Methods}
\code{exprSet2} objects inherit a \code{\Link{show}} method from the virtual class \code{\Link{LargeDataObject}}, which means that \code{exprSet2} objects will print in a compact way.\end{Section}
\begin{Author}\relax
Gordon Smyth
\end{Author}
\begin{SeeAlso}\relax
\link{2.Classes} gives an overview of all the classes defined by this package.

\code{\Link{exprSet}} is the corresponding class in the Biobase package.\end{SeeAlso}

