Scaled Problem

ScaledProblem.java

	public class ScaledProblem implements Problem {
		
		private final Problem problem;
		
		private final double[] factors;
		
		public ScaledProblem(Problem problem, double base) {
			super();
			this.problem = problem;
			
			factors = new double[problem.getNumberOfObjectives()];
			
			for (int i = 0; i < problem.getNumberOfObjectives(); i++) {
				factors[i] = Math.pow(base, i);
			}
		}

		@Override
		public String getName() {
			return "Scaled " + problem.getName();
		}

		@Override
		public int getNumberOfVariables() {
			return problem.getNumberOfVariables();
		}

		@Override
		public int getNumberOfObjectives() {
			return problem.getNumberOfObjectives();
		}

		@Override
		public int getNumberOfConstraints() {
			return problem.getNumberOfConstraints();
		}

		@Override
		public void evaluate(Solution solution) {
			problem.evaluate(solution);
			
			for (int i = 0; i < problem.getNumberOfObjectives(); i++) {
				solution.setObjective(i, solution.getObjective(i) * factors[i]);
			}
		}

		@Override
		public Solution newSolution() {
			return problem.newSolution();
		}

		@Override
		public void close() {
			problem.close();
		}
		
		public void scaleReferenceSet(File file, File scaledFile) throws IOException {
			Population population = PopulationIO.readObjectives(file);
			
			for (Solution solution : population) {
				for (int i = 0; i < solution.getNumberOfObjectives(); i++) {
					solution.setObjective(i, solution.getObjective(i) * factors[i]);
				}
			}
			
			PopulationIO.writeObjectives(scaledFile, population);
		}

	}