\name{nodeAttrs}
 \alias{nodeAttrs}
 \title{Generate node attributes}
 \usage{
   nodeAttrs(nbAn, nbComp, labAn, labComp, file)
 }
 \arguments{
   \item{nbAn}{Number of analyses being considered, i.e
   number of IcaSet objects}
 
   \item{nbComp}{Number of components by analysis, if of
   length 1 then it is assumed that each analysis has the
   same number of components.}
 
   \item{labAn}{Labels of the analysis, if missing it will
   be generated as an1, an2, ...}
 
   \item{labComp}{List containing the component labels
   indexed by analysis, if missing will be generated as
   comp1, comp2, ...}
 
   \item{file}{File where the description of the node
   attributes will be written}
 }
 \value{
   A data.frame describing each node/component
 }
 \description{
   This function builds a data.frame describing for each
   node of the graph its ID and which analysis/data it comes
   from.
 }
 \details{
   The created file is used in Cytoscape.
 }
 \examples{
 ## 4 datasets, 20 components calculated in each dataset, labAn
 nodeAttrs(nbAn=4, nbComp=20, labAn=c("tutu","titi","toto","tata"))
 }
 \author{
   Anne Biton
 }