\title{Retrieve feature/gene projections stored in an \code{\link{IcaSet}} object
  as a list.}
\description{These generic functions retrieve, from an IcaSet object,
  the feature and gene projections contained in
  the attribute \code{S} and \code{SByGene}  as
  a list where feature and gene IDs are preserved.
  \item{object}{Object of class \code{IcaSet}.}
  \code{Slist} and \code{SlistByGene} return a list whose length equals the number of
  components contained in the \code{IcaSet} object. Each element of this
  list contains a vector of feature or gene projections 
  indexed by the feature or gene IDs.
\author{Anne Biton}