Package org.flag4j.operations.sparse.coo.real

Class RealSparseMatrixMultiplication

java.lang.Object

org.flag4j.operations.sparse.coo.real.RealSparseMatrixMultiplication

public class RealSparseMatrixMultiplication
extends Object

This class contains low level implementations of matrix multiplication for real sparse matrices. WARNING: This class does not provide sanity checks.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	RealSparseMatrixMultiplication()

Method Summary

Modifier and Type	Method	Description
static double[]	concurrentStandard(double[] src1, int[] rowIndices1, int[] colIndices1, Shape shape1, double[] src2, int[] rowIndices2, int[] colIndices2, Shape shape2)	Computes the matrix multiplication between two sparse matrices using a concurrent implementation of the standard algorithm.
static double[]	concurrentStandardVector(double[] src1, int[] rowIndices1, int[] colIndices1, Shape shape1, double[] src2, int[] indices)	Computes the multiplication between a sparse matrix and a sparse vector using a concurrent implementation of the standard algorithm.
static double[]	standard(double[] src1, int[] rowIndices1, int[] colIndices1, Shape shape1, double[] src2, int[] rowIndices2, int[] colIndices2, Shape shape2)	Computes the matrix multiplication between two sparse matrices using a standard algorithm.
static double[]	standardVector(double[] src1, int[] rowIndices1, int[] colIndices1, Shape shape1, double[] src2, int[] indices)	Computes the multiplication between a sparse matrix and a sparse vector using a standard algorithm.

Methods inherited from class java.lang.Object

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

Constructor Details

RealSparseMatrixMultiplication

private RealSparseMatrixMultiplication()

Method Details

standard

public static double[] standard(double[] src1,
 int[] rowIndices1,
 int[] colIndices1,
 Shape shape1,
 double[] src2,
 int[] rowIndices2,
 int[] colIndices2,
 Shape shape2)

Computes the matrix multiplication between two sparse matrices using a standard algorithm.

Parameters:

src1 - Non-zero entries of the first sparse matrix.

rowIndices1 - Row indices of non-zero entries for the first sparse matrix.

colIndices1 - Column indices of non-zero entries for the first sparse matrix.

shape1 - Shape of the first sparse matrix.

src2 - Non-zero entries of the second sparse matrix.

rowIndices2 - Row indices of non-zero entries for the second sparse matrix.

colIndices2 - column indices of non-zero entries for the second sparse matrix.

shape2 - Shape of the second sparse matrix.

Returns:

The result of the matrix multiplication stored in a dense matrix.

concurrentStandard

public static double[] concurrentStandard(double[] src1,
 int[] rowIndices1,
 int[] colIndices1,
 Shape shape1,
 double[] src2,
 int[] rowIndices2,
 int[] colIndices2,
 Shape shape2)

Computes the matrix multiplication between two sparse matrices using a concurrent implementation of the standard algorithm.

NOTE: Caution should be exercised when using this method. It is rarely faster than standard(double[], int[], int[], Shape, double[], int[], int[], Shape)

Parameters:

src1 - Non-zero entries of the first sparse matrix.

rowIndices1 - Row indices of non-zero entries for the first sparse matrix.

colIndices1 - Column indices of non-zero entries for the first sparse matrix.

shape1 - Shape of the first sparse matrix.

src2 - Non-zero entries of the second sparse matrix.

rowIndices2 - Row indices of non-zero entries for the second sparse matrix.

colIndices2 - column indices of non-zero entries for the second sparse matrix.

shape2 - Shape of the second sparse matrix.

Returns:

The result of the matrix multiplication stored in a dense matrix.

standardVector

public static double[] standardVector(double[] src1,
 int[] rowIndices1,
 int[] colIndices1,
 Shape shape1,
 double[] src2,
 int[] indices)

Computes the multiplication between a sparse matrix and a sparse vector using a standard algorithm.

Parameters:

src1 - Non-zero entries of the first sparse matrix.

rowIndices1 - Row indices of non-zero entries for the first sparse matrix.

colIndices1 - Column indices of non-zero entries for the first sparse matrix.

shape1 - Shape of the first sparse matrix.

src2 - Non-zero entries of the second sparse matrix.

indices - Indices of non-zero entries in the sparse vector.

Returns:

The result of the matrix-vector multiplication stored in a dense matrix.

concurrentStandardVector

public static double[] concurrentStandardVector(double[] src1,
 int[] rowIndices1,
 int[] colIndices1,
 Shape shape1,
 double[] src2,
 int[] indices)

Computes the multiplication between a sparse matrix and a sparse vector using a concurrent implementation of the standard algorithm.

Parameters:

src1 - Non-zero entries of the first sparse matrix.

rowIndices1 - Row indices of non-zero entries for the first sparse matrix.

colIndices1 - Column indices of non-zero entries for the first sparse matrix.

shape1 - Shape of the first sparse matrix.

src2 - Non-zero entries of the second sparse matrix.

indices - Indices of non-zero entries in the sparse vector.

Returns:

The result of the matrix-vector multiplication stored in a dense matrix.