Package org.apfloat.aparapi

Class LongAparapiNTTStepStrategy

java.lang.Object

org.apfloat.internal.LongElementaryModMath

org.apfloat.internal.LongModMath

org.apfloat.internal.LongTableFNT

org.apfloat.internal.LongNTTStepStrategy

org.apfloat.aparapi.LongAparapiNTTStepStrategy

All Implemented Interfaces:

Parallelizable, NTTStepStrategy

public class LongAparapiNTTStepStrategy
extends LongNTTStepStrategy

NTT steps for the long element type aparapi transforms.

Since:

1.8.3

Version:

1.8.3

Author:

Mikko Tommila

Constructor Summary

Constructors

Constructor	Description
LongAparapiNTTStepStrategy()	Default constructor.

Method Summary

Modifier and Type	Method	Description
void	multiplyElements(ArrayAccess arrayAccess, int startRow, int startColumn, int rows, int columns, long length, long totalTransformLength, boolean isInverse, int modulus)	Multiply each matrix element (i, j) by wi * j / totalTransformLength.
void	transformRows(ArrayAccess arrayAccess, int length, int count, boolean isInverse, boolean permute, int modulus)	Transform the columns of the data matrix.

Methods inherited from class org.apfloat.internal.LongNTTStepStrategy

createMultiplyElementsParallelRunnable, createTransformRowsParallelRunnable, getMaxTransformLength

Methods inherited from class org.apfloat.internal.LongTableFNT

inverseTableFNT, tableFNT

Methods inherited from class org.apfloat.internal.LongModMath

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

Methods inherited from class org.apfloat.internal.LongElementaryModMath

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

LongAparapiNTTStepStrategy

public LongAparapiNTTStepStrategy()

Default constructor.

Method Details

multiplyElements

public void multiplyElements(ArrayAccess arrayAccess,
 int startRow,
 int startColumn,
 int rows,
 int columns,
 long length,
 long totalTransformLength,
 boolean isInverse,
 int modulus)
                      throws ApfloatRuntimeException

Description copied from interface: NTTStepStrategy

Multiply each matrix element (i, j) by wi * j / totalTransformLength. The matrix size is n₁ x n₂.

Specified by:

multiplyElements in interface NTTStepStrategy

Overrides:

multiplyElements in class LongNTTStepStrategy

Parameters:

arrayAccess - The memory array to multiply.

startRow - Which row in the whole matrix the starting row in the arrayAccess is.

startColumn - Which column in the whole matrix the starting column in the arrayAccess is.

rows - The number of rows in the arrayAccess to multiply.

columns - The number of columns in the matrix (= n₂).

length - The length of data in the matrix being transformed.

totalTransformLength - The total transform length, for the scaling factor. Used only for the inverse case.

isInverse - If the multiplication is done for the inverse transform or not.

modulus - Index of the modulus.

Throws:

ApfloatRuntimeException

transformRows

public void transformRows(ArrayAccess arrayAccess,
 int length,
 int count,
 boolean isInverse,
 boolean permute,
 int modulus)
                   throws ApfloatRuntimeException

Transform the columns of the data matrix. Note that this method expects the data to be organized in columns, not rows. The arguments length and count still mean the length of one transform and number of transforms to be done.

Specified by:

transformRows in interface NTTStepStrategy

Overrides:

transformRows in class LongNTTStepStrategy

Parameters:

arrayAccess - The memory array to split to columns and to transform.

length - Length of one transform (one columns).

count - Number of columns.

isInverse - true if an inverse transform is performed, false if a forward transform is performed.

permute - If permutation should be done.

modulus - Index of the modulus.

Throws:

ApfloatRuntimeException