org.apache.commons.math3.transform

Enum DstNormalization

java.lang.Object

java.lang.Enum<DstNormalization>

org.apache.commons.math3.transform.DstNormalization

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<DstNormalization>

public enum DstNormalization
extends java.lang.Enum<DstNormalization>

This enumeration defines the various types of normalizations that can be applied to discrete sine transforms (DST). The exact definition of these normalizations is detailed below.

Since:

3.0

See Also:

FastSineTransformer

Enum Constant Summary

Enum Constants

Enum Constant and Description
ORTHOGONAL_DST_I Should be passed to the constructor of FastSineTransformer to use the orthogonal normalization convention.
STANDARD_DST_I Should be passed to the constructor of FastSineTransformer to use the standard normalization convention.

Method Summary

Methods

Modifier and Type	Method and Description
static DstNormalization	valueOf(java.lang.String name) Returns the enum constant of this type with the specified name.
static DstNormalization[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

STANDARD_DST_I

public static final DstNormalization STANDARD_DST_I

Should be passed to the constructor of FastSineTransformer to use the standard normalization convention. The standard DST-I normalization convention is defined as follows

• forward transform: y_n = ∑_k=0^N-1 x_k sin(π nk / N),
• inverse transform: x_k = (2 / N) ∑_n=0^N-1 y_n sin(π nk / N),

where N is the size of the data sample, and x₀ = 0.

ORTHOGONAL_DST_I

public static final DstNormalization ORTHOGONAL_DST_I

Should be passed to the constructor of FastSineTransformer to use the orthogonal normalization convention. The orthogonal DCT-I normalization convention is defined as follows

• Forward transform: y_n = √(2 / N) ∑_k=0^N-1 x_k sin(π nk / N),
• Inverse transform: x_k = √(2 / N) ∑_n=0^N-1 y_n sin(π nk / N),

which makes the transform orthogonal. N is the size of the data sample, and x₀ = 0.

Method Detail

values

public static DstNormalization[] 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 (DstNormalization c : DstNormalization.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static DstNormalization valueOf(java.lang.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:

java.lang.IllegalArgumentException - if this enum type has no constant with the specified name

java.lang.NullPointerException - if the argument is null