addhicnorm<-function(interactions,res){
interactions<-interactions[which(!is.infinite(interactions$expected)),]
interactions$locus1<-(interactions$locus1 %/% res)*res
interactions$locus2<-(interactions$locus2 %/% res)*res
final<-ddply(interactions, .(chr1,locus1,chr2,locus2), numcolwise(sum))
return(final)
}
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