Enum NonLinearConjugateGradientOptimizer.Formula

java.lang.Object
java.lang.Enum<NonLinearConjugateGradientOptimizer.Formula>
org.apache.commons.math3.optim.nonlinear.scalar.gradient.NonLinearConjugateGradientOptimizer.Formula
All Implemented Interfaces:
Serializable, Comparable<NonLinearConjugateGradientOptimizer.Formula>
Enclosing class:
NonLinearConjugateGradientOptimizer

public static enum NonLinearConjugateGradientOptimizer.Formula extends Enum<NonLinearConjugateGradientOptimizer.Formula>
Available choices of update formulas for the updating the parameter that is used to compute the successive conjugate search directions. For non-linear conjugate gradients, there are two formulas:
  • Fletcher-Reeves formula
  • Polak-Ribière formula
On the one hand, the Fletcher-Reeves formula is guaranteed to converge if the start point is close enough of the optimum whether the Polak-Ribière formula may not converge in rare cases. On the other hand, the Polak-Ribière formula is often faster when it does converge. Polak-Ribière is often used.
Since:
2.0
  • Enum Constant Details

  • Constructor Details

    • Formula

      private Formula()
  • Method Details

    • values

      Returns an array containing the constants of this enum type, in the order they are declared.
      Returns:
      an array containing the constants of this enum type, in the order they are declared
    • valueOf

      Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
      Parameters:
      name - the name of the enum constant to be returned.
      Returns:
      the enum constant with the specified name
      Throws:
      IllegalArgumentException - if this enum type has no constant with the specified name
      NullPointerException - if the argument is null