/**
* return a random individual (other than i unless i is the only member in the population).
*
* @param individuals List // List<DPSOIndividual>
* @param i int
* @param gen int unused
* @param params HashMap must contain an entry <"thread.id",Integer val>
* @return DPSOIndividual
*/
public DPSOIndividual getBestIndividual(List individuals, int i, int gen, HashMap params) {
final int indsz = individuals.size();
final int id = ((Integer) params.get("thread.id")).intValue();
final RndUtil rndgen = RndUtil.getInstance(id);
int j = rndgen.getRandom().nextInt(indsz);
if (j == i) {
if (i < indsz / 2) ++j;
else if (i > 0) --j; // if i==0 && i>=indsz/2 ==> indsz <= 1 thus keep j=0
}
DPSOIndividual ret = (DPSOIndividual) individuals.get(j);
return ret;
}
