org.ejml.alg.block

Class BlockInnerRankUpdate

java.lang.Object

org.ejml.alg.block.BlockInnerRankUpdate

public class BlockInnerRankUpdate
extends java.lang.Object

Performs rank-n update operations on the inner blocks of a BlockMatrix64F It is assumed and not checked that the submatrices are aligned along the matrix's blocks.

Constructor Summary

Constructors

Constructor and Description
BlockInnerRankUpdate()

Method Summary

Modifier and Type	Method and Description
static void	rankNUpdate(int blockLength, double alpha, D1Submatrix64F A, D1Submatrix64F B) Performs: A = A + α B TB
static void	symmRankNMinus_L(int blockLength, D1Submatrix64F A, D1Submatrix64F B) Rank N update function for a symmetric inner submatrix and only operates on the lower triangular portion of the submatrix. A = A - B*BT
static void	symmRankNMinus_U(int blockLength, D1Submatrix64F A, D1Submatrix64F B) Rank N update function for a symmetric inner submatrix and only operates on the upper triangular portion of the submatrix. A = A - B TB

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockInnerRankUpdate

public BlockInnerRankUpdate()

Method Detail

rankNUpdate

public static void rankNUpdate(int blockLength,
                               double alpha,
                               D1Submatrix64F A,
                               D1Submatrix64F B)

Performs:

A = A + α B ^TB

Parameters:

blockLength - Size of the block in the block matrix.

alpha - scaling factor for right hand side.

A - Block aligned submatrix.

B - Block aligned submatrix.

symmRankNMinus_U

public static void symmRankNMinus_U(int blockLength,
                                    D1Submatrix64F A,
                                    D1Submatrix64F B)

Rank N update function for a symmetric inner submatrix and only operates on the upper triangular portion of the submatrix.

A = A - B ^TB

symmRankNMinus_L

public static void symmRankNMinus_L(int blockLength,
                                    D1Submatrix64F A,
                                    D1Submatrix64F B)

Rank N update function for a symmetric inner submatrix and only operates on the lower triangular portion of the submatrix.

A = A - B*B^T