Package org.apfloat.internal

Class DoubleWTables

java.lang.Object

org.apfloat.internal.DoubleElementaryModMath

org.apfloat.internal.DoubleModMath

org.apfloat.internal.DoubleWTables

public class DoubleWTables
extends DoubleModMath

Helper class for generating and caching tables of powers of the n:th root of unity.

Since:

1.7.0

Version:

1.9.0

Author:

Mikko Tommila

Method Summary

Modifier and Type	Method	Description
static double[]	getInverseWTable(int modulus, int length)	Get a table of inverses of powers of n:th root of unity.
static double[]	getWTable(int modulus, int length)	Get a table of powers of n:th root of unity.

Methods inherited from class org.apfloat.internal.DoubleModMath

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

Methods inherited from class org.apfloat.internal.DoubleElementaryModMath

getModulus, modAdd, modMultiply, modSubtract, setModulus

Methods inherited from class java.lang.Object

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

Method Details

getWTable

public static double[] getWTable(int modulus,
 int length)

Get a table of powers of n:th root of unity.

Parameters:

modulus - The index of the modulus to be used.

length - The length of the table to be returned, i.e. n.

Returns:

The table of powers of the n:th root of unity.

getInverseWTable

public static double[] getInverseWTable(int modulus,
 int length)

Get a table of inverses of powers of n:th root of unity.

Parameters:

modulus - The index of the modulus to be used.

length - The length of the table to be returned, i.e. n.

Returns:

The table of inverses of powers of the n:th root of unity.