Nothing

```
crowdingDist4frnt <-
function(pop,rnk,rng){
popSize <- nrow(pop);
objDim <- length(rng);
varNo <- ncol(pop)-1-length(rng);
cd <- matrix(Inf,nrow=popSize,ncol=objDim);
for (i in 1:length(rnk)){
selectRow <- pop[,ncol(pop)]==i;
len <- length(rnk[[i]]);
if (len > 2) {
for (j in 1:objDim) {
originalIdx <- rnk[[i]][order(pop[selectRow,varNo+j])];
cd[originalIdx[2:(len-1)],j] = abs(pop[originalIdx[3:len],varNo+j] - pop[originalIdx[1:(len-2)],varNo+j])/rng[j];
}
}
}
return(cd);
}
```

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