/** Updates the reference point */
private void updateReferencePoint(SolutionSet solutionSet) {
double[] maxObjectives = new double[numberOfObjectives];
for (int i = 0; i < numberOfObjectives; i++) {
maxObjectives[i] = 0;
}
for (int i = 0; i < solutionSet.size(); i++) {
for (int j = 0; j < numberOfObjectives; j++) {
if (maxObjectives[j] < solutionSet.get(i).getObjective(j)) {
maxObjectives[j] = solutionSet.get(i).getObjective(j);
}
}
}
for (int i = 0; i < referencePoint.getNumberOfObjectives(); i++) {
referencePoint.setObjective(i, maxObjectives[i] + offset);
}
}
/**
* Computes the HV of a solutiontype set. REQUIRES: The problem is bi-objective REQUIRES: The
* setArchive is ordered in descending order by the second objective
*
* @return
*/
public double get2DHV(SolutionSet solutionSet) {
double hv = 0.0;
if (solutionSet.size() > 0) {
hv =
Math.abs(
(solutionSet.get(0).getObjective(0) - referencePoint.getObjective(0))
* (solutionSet.get(0).getObjective(1) - referencePoint.getObjective(1)));
for (int i = 1; i < solutionSet.size(); i++) {
double tmp =
Math.abs(
(solutionSet.get(i).getObjective(0) - referencePoint.getObjective(0))
* (solutionSet.get(i).getObjective(1)
- solutionSet.get(i - 1).getObjective(1)));
hv += tmp;
}
}
return hv;
}
/**
* Evaluates a solution
*
* @param solution The solution to evaluate
* @throws org.uma.jmetal.util.JMetalException
*/
public final void evaluate(Solution solution) throws JMetalException {
float[] variables = new float[getNumberOfVariables()];
XReal sol = new XReal(solution);
double[] x = new double[numberOfVariables];
for (int i = 0; i < numberOfVariables; i++) {
x[i] = sol.getValue(i);
}
for (int i = 0; i < getNumberOfVariables(); i++) {
variables[i] = (float) x[i];
}
float[] f = evaluate(variables);
for (int i = 0; i < f.length; i++) {
solution.setObjective(i, f[i]);
}
}