\title{Generate node attributes}
   nodeAttrs(nbAn, nbComp, labAn, labComp, file)
   \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}
   A data.frame describing each node/component
   This function builds a data.frame describing for each
   node of the graph its ID and which analysis/data it comes
   The created file is used in Cytoscape.
 ## 4 datasets, 20 components calculated in each dataset, labAn
 nodeAttrs(nbAn=4, nbComp=20, labAn=c("tutu","titi","toto","tata"))
   Anne Biton