Class SimpleRealPointChecker

  • All Implemented Interfaces:

    public class SimpleRealPointChecker
    extends Object
    implements RealConvergenceChecker
    Simple implementation of the RealConvergenceChecker interface using only point coordinates.

    Convergence is considered to have been reached if either the relative difference between each point coordinate are smaller than a threshold or if either the absolute difference between the point coordinates are smaller than another threshold.

    • Constructor Detail

      • SimpleRealPointChecker

        public SimpleRealPointChecker()
        Build an instance with default threshold.
      • SimpleRealPointChecker

        public SimpleRealPointChecker​(double relativeThreshold,
                                      double absoluteThreshold)
        Build an instance with a specified threshold.

        In order to perform only relative checks, the absolute tolerance must be set to a negative value. In order to perform only absolute checks, the relative tolerance must be set to a negative value.

        relativeThreshold - relative tolerance threshold
        absoluteThreshold - absolute tolerance threshold
    • Method Detail

      • converged

        public boolean converged​(int iteration,
                                 RealPointValuePair previous,
                                 RealPointValuePair current)
        Check if the optimization algorithm has converged considering the last points.

        This method may be called several time from the same algorithm iteration with different points. This can be detected by checking the iteration number at each call if needed. Each time this method is called, the previous and current point correspond to points with the same role at each iteration, so they can be compared. As an example, simplex-based algorithms call this method for all points of the simplex, not only for the best or worst ones.

        Specified by:
        converged in interface RealConvergenceChecker
        iteration - index of current iteration
        previous - point from previous iteration
        current - point from current iteration
        true if the algorithm is considered to have converged