Enum 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.
    • Method Detail

      • values

        public static NonLinearConjugateGradientOptimizer.Formula[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
        for (NonLinearConjugateGradientOptimizer.Formula c : NonLinearConjugateGradientOptimizer.Formula.values())
            System.out.println(c);
        
        Returns:
        an array containing the constants of this enum type, in the order they are declared
      • valueOf

        public static NonLinearConjugateGradientOptimizer.Formula valueOf​(String name)
        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