\name{methods-eSet}

 \alias{chromosome}
 \alias{chromosome,eSet-method}

 \alias{cnIndex}
 \alias{cnIndex,eSet-method}

 \alias{position}
 \alias{position,eSet-method}

 \alias{snpIndex}
 \alias{snpIndex,eSet-method}
 
 \title{Methods for eSet derivatives}
 
 \description{

   \code{chromosome} return the chromosome number for SNP and NP probes.
     
   \code{cnIndex, ...} return the row indices of copy number probes.

   \code{position} return the physical position of the SNP or the
   physical position for the first index of the NP probe.
   

   \code{snpIndex, ...} return the row indices of polymorphic loci.

 
 }
 
 \usage{
 

   chromosome(object)

   cnIndex(object, ...)

   position(object)

   snpIndex(object, ...)

 
 }
 
 \arguments{
   
   \item{object}{Any object extending eSet (ABset, CopyNumberSet,
     CrlmmSetList, SnpSet}
 

   \item{\dots}{Usually the character string indicating annotation package.}

 }
 
 \value{
 
   Vector of indices.
 
 }
 
 \seealso{
 
   \code{"\linkS4class{ABset}"}
   \code{"\linkS4class{CopyNumberSet}"}
   \code{"\linkS4class{CrlmmSetList}"}
   
 }
   
 
 \keyword{manip}