private void prepareSetupBestSolutions() {
bestDecisionVariables_ = new DecisionVariables[numberOfSolutions_];
// Assign the best DVs of another islands
int[] indices = RandomVector.getRandomVector_Int(numberOfSolutions_, population_.size());
for (int i = 0; i < numberOfSolutions_; ++i)
bestDecisionVariables_[i] = population_.get(indices[i]).getDecisionVariables();
} // prepareBestSolutions
private void prepareBestSolutions() {
bestDecisionVariables_ = new DecisionVariables[numberOfSolutions_];
Ranking ranking = new Ranking(population_);
int remain;
SolutionSet subfront = ranking.getSubfront(0);
int sz = subfront.size();
int rest = population_.size() - sz;
int i;
if ((sz >= bestSolutionsFirstLevel_)
&& (ranking.getNumberOfSubfronts() > 1)
&& (rest >= (numberOfSolutions_ - bestSolutionsFirstLevel_))) {
// Subfront is enought big and the remain is assured
int[] indices = RandomVector.getRandomVector_Int(bestSolutionsFirstLevel_, sz);
for (i = 0; i < bestSolutionsFirstLevel_; ++i)
bestDecisionVariables_[i] = subfront.get(indices[i]).getDecisionVariables();
remain = numberOfSolutions_ - bestSolutionsFirstLevel_;
} // if
else if (rest < (numberOfSolutions_ - bestSolutionsFirstLevel_)) {
// The rest of subfronts are so little
int[] indices = RandomVector.getRandomVector_Int(numberOfSolutions_, sz);
for (i = 0; i < numberOfSolutions_; ++i)
bestDecisionVariables_[i] = subfront.get(indices[i]).getDecisionVariables();
remain = 0;
} // else if
else if (numberOfSolutions_ == 1) {
int[] indices = RandomVector.getRandomVector_Int(bestSolutionsFirstLevel_, sz);
bestDecisionVariables_[0] = subfront.get(indices[0]).getDecisionVariables();
remain = 0;
i = 1;
} // else if
else {
int[] indices = RandomVector.getRandomVector_Int(sz, sz);
for (i = 0; i < sz; ++i)
bestDecisionVariables_[i] = subfront.get(indices[i]).getDecisionVariables();
remain = numberOfSolutions_ - sz;
} // else
int index = 1;
while ((index < ranking.getNumberOfSubfronts()) && (remain > 0)) {
subfront = ranking.getSubfront(index);
sz = subfront.size();
if (sz >= remain) {
int[] indices = RandomVector.getRandomVector_Int(remain, sz);
for (int j = 0; j < remain; ++j, ++i)
bestDecisionVariables_[i] = subfront.get(indices[j]).getDecisionVariables();
remain = 0;
} // if
else {
int[] indices = RandomVector.getRandomVector_Int(sz, sz);
for (int j = 0; j < sz; ++j, ++i, --remain)
bestDecisionVariables_[i] = subfront.get(indices[j]).getDecisionVariables();
} // else
++index;
} // while
} // prepareBestSolutions