Package org.apache.commons.math3.optimization.direct

Class MultiDirectionalSimplex

java.lang.Object
org.apache.commons.math3.optimization.direct.AbstractSimplex
org.apache.commons.math3.optimization.direct.MultiDirectionalSimplex
All Implemented Interfaces:
OptimizationData
@Deprecated public class MultiDirectionalSimplex extends AbstractSimplex
Deprecated.
As of 3.1 (to be removed in 4.0).
This class implements the multi-directional direct search method.
Since:
3.0

  • Field Details

    • DEFAULT_KHI

      private static final double DEFAULT_KHI
      Deprecated.
      Default value for khi: 2.0.
      See Also:

    • DEFAULT_GAMMA

      private static final double DEFAULT_GAMMA
      Deprecated.
      Default value for gamma: 0.5.
      See Also:

    • khi

      private final double khi
      Deprecated.
      Expansion coefficient.

    • gamma

      private final double gamma
      Deprecated.
      Contraction coefficient.

  • Constructor Details

    • MultiDirectionalSimplex

      public MultiDirectionalSimplex(int n)
      Deprecated.
      Build a multi-directional simplex with default coefficients. The default values are 2.0 for khi and 0.5 for gamma.
      Parameters:
      n - Dimension of the simplex.

    • MultiDirectionalSimplex

      public MultiDirectionalSimplex(int n, double sideLength)
      Deprecated.
      Build a multi-directional simplex with default coefficients. The default values are 2.0 for khi and 0.5 for gamma.
      Parameters:
      n - Dimension of the simplex.
      sideLength - Length of the sides of the default (hypercube) simplex. See AbstractSimplex(int,double).

    • MultiDirectionalSimplex

      public MultiDirectionalSimplex(int n, double khi, double gamma)
      Deprecated.
      Build a multi-directional simplex with specified coefficients.
      Parameters:
      n - Dimension of the simplex. See AbstractSimplex(int,double).
      khi - Expansion coefficient.
      gamma - Contraction coefficient.

    • MultiDirectionalSimplex

      public MultiDirectionalSimplex(int n, double sideLength, double khi, double gamma)
      Deprecated.
      Build a multi-directional simplex with specified coefficients.
      Parameters:
      n - Dimension of the simplex. See AbstractSimplex(int,double).
      sideLength - Length of the sides of the default (hypercube) simplex. See AbstractSimplex(int,double).
      khi - Expansion coefficient.
      gamma - Contraction coefficient.

    • MultiDirectionalSimplex

      public MultiDirectionalSimplex(double[] steps)
      Deprecated.
      Build a multi-directional simplex with default coefficients. The default values are 2.0 for khi and 0.5 for gamma.
      Parameters:
      steps - Steps along the canonical axes representing box edges. They may be negative but not zero. See

    • MultiDirectionalSimplex

      public MultiDirectionalSimplex(double[] steps, double khi, double gamma)
      Deprecated.
      Build a multi-directional simplex with specified coefficients.
      Parameters:
      steps - Steps along the canonical axes representing box edges. They may be negative but not zero. See AbstractSimplex(double[]).
      khi - Expansion coefficient.
      gamma - Contraction coefficient.

    • MultiDirectionalSimplex

      public MultiDirectionalSimplex(double[][] referenceSimplex)
      Deprecated.
      Build a multi-directional simplex with default coefficients. The default values are 2.0 for khi and 0.5 for gamma.
      Parameters:
      referenceSimplex - Reference simplex. See AbstractSimplex(double[][]).

    • MultiDirectionalSimplex

      public MultiDirectionalSimplex(double[][] referenceSimplex, double khi, double gamma)
      Deprecated.
      Build a multi-directional simplex with specified coefficients.
      Parameters:
      referenceSimplex - Reference simplex. See AbstractSimplex(double[][]).
      khi - Expansion coefficient.
      gamma - Contraction coefficient.
      Throws:
      NotStrictlyPositiveException - if the reference simplex does not contain at least one point.
      DimensionMismatchException - if there is a dimension mismatch in the reference simplex.

  • Method Details

    • iterate

      public void iterate(MultivariateFunction evaluationFunction, Comparator<PointValuePair> comparator)
      Deprecated.
      Compute the next simplex of the algorithm.
      Specified by:
      iterate in class AbstractSimplex
      Parameters:
      evaluationFunction - Evaluation function.
      comparator - Comparator to use to sort simplex vertices from best to worst.

    • evaluateNewSimplex

      private PointValuePair evaluateNewSimplex(MultivariateFunction evaluationFunction, PointValuePair[] original, double coeff, Comparator<PointValuePair> comparator)
      Deprecated.
      Compute and evaluate a new simplex.
      Parameters:
      evaluationFunction - Evaluation function.
      original - Original simplex (to be preserved).
      coeff - Linear coefficient.
      comparator - Comparator to use to sort simplex vertices from best to poorest.
      Returns:
      the best point in the transformed simplex.
      Throws:
      TooManyEvaluationsException - if the maximal number of evaluations is exceeded.