Package org.hipparchus.transform
Enum DftNormalization
- All Implemented Interfaces:
Serializable
,Comparable<DftNormalization>
,java.lang.constant.Constable
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:
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Nested Class Summary
Nested classes/interfaces inherited from class java.lang.Enum
Enum.EnumDesc<E extends Enum<E>>
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Enum Constant Summary
Enum ConstantDescriptionShould be passed to the constructor ofFastFourierTransformer
to use the standard normalization convention.Should be passed to the constructor ofFastFourierTransformer
to use the unitary normalization convention. -
Method Summary
Modifier and TypeMethodDescriptionstatic DftNormalization
Returns the enum constant of this type with the specified name.static DftNormalization[]
values()
Returns an array containing the constants of this enum type, in the order they are declared.
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Enum Constant Details
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STANDARD
Should be passed to the constructor ofFastFourierTransformer
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-1 ∑n=0N-1 yn exp(2πi n k / N),
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UNITARY
Should be passed to the constructor ofFastFourierTransformer
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),
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Method Details
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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
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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 nameNullPointerException
- if the argument is null
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