\HeaderA{readCdfGroupNames}{Reads group names for a set of units (probesets) in an Affymetrix CDF file}{readCdfGroupNames}
\keyword{file}{readCdfGroupNames}
\keyword{IO}{readCdfGroupNames}
\begin{Description}\relax
Reads group names for a set of units (probesets) in an Affymetrix CDF file.

This is for instance useful for SNP arrays where the nucleotides used
for the A and B alleles are the same as the group names.
\end{Description}
\begin{Usage}
\begin{verbatim}readCdfGroupNames(filename, units=NULL, verbose=0)\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{filename}] The filename of the CDF file.
\item[\code{units}] An \code{\LinkA{integer}{integer}} \code{\LinkA{vector}{vector}} of unit indices specifying which
units to be read.  If \code{\LinkA{NULL}{NULL}}, all units are read.
\item[\code{verbose}] An \code{\LinkA{integer}{integer}} specifying the verbose level. If 0, the
file is parsed quietly.  The higher numbers, the more details.
\end{ldescription}
\end{Arguments}
\begin{Value}
A named \code{\LinkA{list}{list}} structure where the names of the elements are the names
of the units read.  Each element is a \code{\LinkA{character}{character}} \code{\LinkA{vector}{vector}} with group
names for the corrsponding unit.
\end{Value}
\begin{Author}\relax
Henrik Bengtsson (\url{http://www.braju.com/R/})
\end{Author}
\begin{SeeAlso}\relax
\code{\LinkA{readCdfUnits}{readCdfUnits}}().
\end{SeeAlso}

