Package org.apfloat.aparapi

Class IntAparapiNTTStepStrategy

java.lang.Object

org.apfloat.internal.IntElementaryModMath

org.apfloat.internal.IntModMath

org.apfloat.internal.IntTableFNT

org.apfloat.internal.IntNTTStepStrategy

org.apfloat.aparapi.IntAparapiNTTStepStrategy

All Implemented Interfaces:

Parallelizable, NTTStepStrategy

public class IntAparapiNTTStepStrategy
extends IntNTTStepStrategy

NTT steps for the int element type aparapi transforms.

Since:

1.8.3

Version:

1.8.3

Constructor Summary

Constructors

Constructor	Description
IntAparapiNTTStepStrategy()	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.IntNTTStepStrategy

createMultiplyElementsParallelRunnable, createTransformRowsParallelRunnable, getMaxTransformLength

Methods inherited from class org.apfloat.internal.IntTableFNT

inverseTableFNT, tableFNT

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 Detail

IntAparapiNTTStepStrategy

public IntAparapiNTTStepStrategy()

Default constructor.

Method Detail

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 IntNTTStepStrategy

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 IntNTTStepStrategy

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