Enum DftNormalization

java.lang.Object
java.lang.Enum<DftNormalization>
org.hipparchus.transform.DftNormalization
All Implemented Interfaces:
Serializable, Comparable<DftNormalization>, java.lang.constant.Constable

public enum DftNormalization extends Enum<DftNormalization>
This enumeration defines the various types of normalizations that can be applied to discrete Fourier transforms (DFT). The exact definition of these normalizations is detailed below.
See Also:
  • Enum Constant Details

    • STANDARD

      public static final DftNormalization STANDARD
      Should be passed to the constructor of FastFourierTransformer to use the standard normalization convention. This normalization convention is defined as follows
      • forward transform: yn = ∑k=0N-1 xk exp(-2πi n k / N),
      • inverse transform: xk = N-1n=0N-1 yn exp(2πi n k / N),
      where N is the size of the data sample.
    • UNITARY

      public static final DftNormalization UNITARY
      Should be passed to the constructor of FastFourierTransformer to use the unitary normalization convention. This normalization convention is defined as follows
      • forward transform: yn = (1 / √N) ∑k=0N-1 xk exp(-2πi n k / N),
      • inverse transform: xk = (1 / √N) ∑n=0N-1 yn exp(2πi n k / N),
      which makes the transform unitary. N is the size of the data sample.
  • Method Details

    • values

      public static DftNormalization[] 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

      public static DftNormalization 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