\title{Retrieve feature and sample values on a component stored in an \code{IcaSet} object.}
 \description{This generic function retrieves, from an \code{\link{IcaSet}} object,
   the feature projections (contained in attribute \code{S}) and
   sample contributions (contained in attribute \code{A})
   corresponding to a specific component.
 getComp(object, level, ind)
   \item{object}{Object of class \code{\link{IcaSet}}.}
   \item{level}{Either "features" to retrieve projections contained in
     \code{S}, or "genes" to retrieve projections contained in
   \item{ind}{The index of the component to be retrieved.}
   \code{getComp}  returns a list containing two elements:
   \describe{\item{proj:}{the feature or gene
       projections on the given component,}\item{contrib:}{the sample
       contributions on the given component.}}
 \author{Anne Biton}