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 \name{readCdfGroupNames}
\alias{readCdfGroupNames}


 \title{Reads group names for a set of units (probesets) in an Affymetrix CDF file}

 \usage{readCdfGroupNames(filename, units=NULL, truncateGroupNames=TRUE, verbose=0)}

 \description{
   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.
 }

 \arguments{
   \item{filename}{The filename of the CDF file.}
   \item{units}{An \code{\link[base]{integer}} \code{\link[base]{vector}} of unit indices specifying which
      units to be read.  If \code{\link[base]{NULL}}, all units are read.}
    \item{truncateGroupNames}{A \code{\link[base]{logical}} variable indicating whether unit
      names should be stripped from the beginning of group names.}
    \item{verbose}{An \code{\link[base]{integer}} specifying the verbose level. If 0, the
      file is parsed quietly.  The higher numbers, the more details.}
 }

 \value{
    A named \code{\link[base]{list}} structure where the names of the elements are the names
    of the units read.  Each element is a \code{\link[base]{character}} \code{\link[base]{vector}} with group
    names for the corrsponding unit.
  }

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

  \seealso{
    \code{\link{readCdfUnits}}().
  }





\keyword{file}
\keyword{IO}