\name{getNumberOfFeatures}
\alias{getNumberOfFeatures}
\title{Retrieves number of features}
\description{Retrieves number of features from an experiment for a given DesignElementDimension}
\usage{
getNumberOfFeatures( mageOM = NULL , DED = "none" )
}

\arguments{
  \item{mageOM}{ R reference to MAGE object model }
  \item{DED}{DesignElementDimension:  If not specified and there is more than one DED present, selection pop-up menus will appear. }
}

\references{Spellman PT, Miller M, Stewart J, Troup C, Sarkans U, Chervitz S, Bernhart D, Sherlock G, Ball C, Lepage M, Swiatek M, Marks WL, Goncalves J, Markel S, Iordan D, Shojatalab M, Pizarro A, White J, Hubley R, Deutsch E, Senger M, Aronow BJ, Robinson A, Bassett D, Stoeckert CJ Jr and Brazma A.
Design and implementation of microarray gene expression markup language (MAGE-ML).
Genome Biol. 2002 Aug 23;3(9):RESEARCH0046.
}

\author{Steffen Durinck, \url{http://www.esat.kuleuven.ac.be/~sdurinck}\cr 
  Joke Allemeersch, \url{http://www.esat.kuleuven.ac.be/~jallemee}.}


\seealso{\code{\link{importMAGEOM}}}

\examples{
if(interactive()){
data <- system.file( "MAGEMLdata", package = "RMAGEML" )
mageom <- importMAGEOM( directory = data )
getNumberOfFeatures( mageOM = mageom )
}
}
\keyword{methods}