Package org.moeaframework.problem.CDTLZ

Class C2_DTLZ2

java.lang.Object
org.moeaframework.problem.AbstractProblem
org.moeaframework.problem.DTLZ.DTLZ
org.moeaframework.problem.DTLZ.DTLZ2
org.moeaframework.problem.CDTLZ.C2_DTLZ2
All Implemented Interfaces:
AutoCloseable, Problem, AnalyticalProblem
public class C2_DTLZ2 extends DTLZ2
The C2-DTLZ2 test problem.

  • Constructor Details

    • C2_DTLZ2

      public C2_DTLZ2(int numberOfVariables, int numberOfObjectives)
      Constructs a C2-DTLZ2 test problem with the specified number of variables and objectives.
      Parameters:
      numberOfVariables - the number of variables for this problem
      numberOfObjectives - the number of objectives for this problem

    • C2_DTLZ2

      public C2_DTLZ2(int numberOfObjectives)
      Constructs a X2-DTLZ2 test problem with the specified number of objectives. This is equivalent to calling new DTLZ2(numberOfObjectives+9, numberOfObjectives).
      Parameters:
      numberOfObjectives - the number of objectives for this problem

  • Method Details

    • getNumberOfConstraints

      public int getNumberOfConstraints()
      Description copied from interface: Problem
      Returns the number of constraints defined by this problem.
      Specified by:
      getNumberOfConstraints in interface Problem
      Overrides:
      getNumberOfConstraints in class AbstractProblem
      Returns:
      the number of constraints defined by this problem

    • evaluate

      public void evaluate(Solution solution)
      Description copied from interface: Problem
      Evaluates the solution, updating the solution's objectives in place. Algorithms must explicitly call this method when appropriate to evaluate new solutions or reevaluate modified solutions.
      Specified by:
      evaluate in interface Problem
      Overrides:
      evaluate in class DTLZ2
      Parameters:
      solution - the solution to be evaluated

    • newSolution

      public Solution newSolution()
      Description copied from interface: Problem
      Returns a new solution for this problem. Implementations must initialize the variables so that the valid range of values is defined, but typically leave the actual value at a default or undefined state.
      Specified by:
      newSolution in interface Problem
      Overrides:
      newSolution in class DTLZ
      Returns:
      a new solution for this problem

    • generate

      public Solution generate()
      Description copied from interface: AnalyticalProblem
      Returns a randomly-generated solution using the analytical solution to this problem. The exact behavior of this method depends on the implementation, but in general (1) the solutions should be non-dominated and (2) spread uniformly across the Pareto front.

      It is not always possible to guarantee these conditions. For example, a discontinuous / disconnected Pareto surface could generate dominated solutions, and a biased problem could result in non-uniform distributions. Therefore, we recommend callers filter solutions through a NondominatedPopulation, in particular one that maintains a spread of solutions.

      Furthermore, some implementations may not provide the corresponding decision variables for the solution. These implementations should indicate this by returning a solution with 0 decision variables.

      Specified by:
      generate in interface AnalyticalProblem
      Overrides:
      generate in class DTLZ2
      Returns:
      a randomly-generated Pareto optimal solution to this problem