Package org.apfloat.internal

Class IntTableFNT

java.lang.Object

org.apfloat.internal.IntElementaryModMath

org.apfloat.internal.IntModMath

org.apfloat.internal.IntTableFNT

Direct Known Subclasses:

IntNTTStepStrategy, IntTableFNTStrategy

public class IntTableFNT
extends IntModMath

Fast Number Theoretic Transform that uses lookup tables for powers of n:th root of unity and permutation indexes.

All access to this class must be externally synchronized.

Since:

1.7.0

Version:

1.7.0

Author:

Mikko Tommila

Constructor Summary

Constructors

Constructor	Description
IntTableFNT()	Default constructor.

Method Summary

Modifier and Type	Method	Description
void	inverseTableFNT(ArrayAccess arrayAccess, int[] wTable, int[] permutationTable)	Inverse (Cooley-Tukey) fast Number Theoretic Transform.
void	tableFNT(ArrayAccess arrayAccess, int[] wTable, int[] permutationTable)	Forward (Sande-Tukey) fast Number Theoretic Transform.

Methods inherited from class org.apfloat.internal.IntModMath

createWTable, getForwardNthRoot, getInverseNthRoot, modDivide, modInverse, modPow, negate

Methods inherited from class org.apfloat.internal.IntElementaryModMath

getModulus, modAdd, modMultiply, modSubtract, setModulus

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

IntTableFNT

public IntTableFNT()

Default constructor.

Method Details

tableFNT

public void tableFNT(ArrayAccess arrayAccess,
 int[] wTable,
 int[] permutationTable)
              throws ApfloatRuntimeException

Forward (Sande-Tukey) fast Number Theoretic Transform. Data length must be a power of two.

Parameters:

arrayAccess - The data array to transform.

wTable - Table of powers of n:th root of unity w modulo the current modulus.

permutationTable - Table of permutation indexes, or null if the data should not be permuted.

Throws:

ApfloatRuntimeException

inverseTableFNT

public void inverseTableFNT(ArrayAccess arrayAccess,
 int[] wTable,
 int[] permutationTable)
                     throws ApfloatRuntimeException

Inverse (Cooley-Tukey) fast Number Theoretic Transform. Data length must be a power of two.

Parameters:

arrayAccess - The data array to transform.

wTable - Table of powers of n:th root of unity w modulo the current modulus.

permutationTable - Table of permutation indexes, or null if the data should not be permuted.

Throws:

ApfloatRuntimeException