\name{getProj}
 \alias{getProj}
 \title{Extract projection values}
 \usage{
   getProj(icaSet, ids, keepComp,
     level = c("features", "genes"))
 }
 \arguments{
   \item{icaSet}{An object of class \code{\link{IcaSet}}}
 
   \item{ids}{feature or gene IDs}
 
   \item{keepComp}{Index of the components to be conserved,
   must be in \code{indComp(icaSet)}}
 
   \item{level}{The level of projections to be extracted,
   either \code{"features"} or \code{"genes"}}
 }
 \value{
   A vector or a list of projection values
 }
 \description{
   Extract projection values of a given set of IDs on a
   subset of components.
 }
 \examples{
 ## load an example of IcaSet
 data(icaSetCarbayo)
 
 ##get the projection of your favorite proliferation genes
 #on all components
 getProj(icaSetCarbayo, ids=c("TOP2A","CDK1","CDC20"), level="genes")
 
 #on some components
 getProj(icaSetCarbayo, ids=c("TOP2A","CDK1","CDC20"),
 keepComp=c(1,6,9,12),level="genes")
 
 ##get the gene projection values on the sixth component
 getProj(icaSetCarbayo, keepComp=6,level="genes")
 }
 \author{
   Anne Biton
 }