org.ejml.alg.block

Class BlockVectorOps

java.lang.Object

org.ejml.alg.block.BlockVectorOps

public class BlockVectorOps
extends java.lang.Object

Math operations for inner vectors (row and column) inside of block matrices:

scale: b_i = α*a_i
div: _i = a_i/α
add: c_i = α*a_i + βB_i
dot: c = sum a_i*b_i

All submatrices must be block aligned. All offsets and end indexes are relative to the beginning of each submatrix.

Constructor Summary

Constructors

Constructor and Description
BlockVectorOps()

Method Summary

Modifier and Type	Method and Description
static void	add_row(int blockLength, D1Submatrix64F A, int rowA, double alpha, D1Submatrix64F B, int rowB, double beta, D1Submatrix64F C, int rowC, int offset, int end) Row vector add: add: ci = α*ai + βBi where 'a', 'b', and 'c' are row vectors within the row block vectors of A, B, and C respectively.
static void	div_row(int blockLength, D1Submatrix64F A, int rowA, double alpha, D1Submatrix64F B, int rowB, int offset, int end) Row vector divide: div: bi = ai/α where 'a' and 'b' are row vectors within the row block vector A and B.
static double	dot_row_col(int blockLength, D1Submatrix64F A, int rowA, D1Submatrix64F B, int colB, int offset, int end) vector dot/inner product from one row vector and one column vector: dot: c = sum ai*bi where 'a' is a row vector 'b' is a column vectors within the row block vector A and B, and 'c' is a scalar.
static double	dot_row(int blockLength, D1Submatrix64F A, int rowA, D1Submatrix64F B, int rowB, int offset, int end) Row vector dot/inner product: dot: c = sum ai*bi where 'a' and 'b' are row vectors within the row block vector A and B, and 'c' is a scalar.
static void	scale_row(int blockLength, D1Submatrix64F A, int rowA, double alpha, D1Submatrix64F B, int rowB, int offset, int end) Row vector scale: scale: bi = α*ai where 'a' and 'b' are row vectors within the row block vector A and B.

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockVectorOps

public BlockVectorOps()

Method Detail

scale_row

public static void scale_row(int blockLength,
                             D1Submatrix64F A,
                             int rowA,
                             double alpha,
                             D1Submatrix64F B,
                             int rowB,
                             int offset,
                             int end)

Row vector scale:
scale: b_i = α*a_i
where 'a' and 'b' are row vectors within the row block vector A and B.

Parameters:

A - submatrix. Not modified.

rowA - which row in A the vector is contained in.

alpha - scale factor.

B - submatrix that the results are written to. Modified.

offset - Index at which the vectors start at.

end - Index at which the vectors end at.

div_row

public static void div_row(int blockLength,
                           D1Submatrix64F A,
                           int rowA,
                           double alpha,
                           D1Submatrix64F B,
                           int rowB,
                           int offset,
                           int end)

Row vector divide:
div: b_i = a_i/α
where 'a' and 'b' are row vectors within the row block vector A and B.

Parameters:

A - submatrix. Not modified.

rowA - which row in A the vector is contained in.

alpha - scale factor.

B - submatrix that the results are written to. Modified.

offset - Index at which the vectors start at.

end - Index at which the vectors end at.

add_row

public static void add_row(int blockLength,
                           D1Submatrix64F A,
                           int rowA,
                           double alpha,
                           D1Submatrix64F B,
                           int rowB,
                           double beta,
                           D1Submatrix64F C,
                           int rowC,
                           int offset,
                           int end)

Row vector add:
add: c_i = α*a_i + βB_i
where 'a', 'b', and 'c' are row vectors within the row block vectors of A, B, and C respectively.

Parameters:

blockLength - Length of each inner matrix block.

A - submatrix. Not modified.

rowA - which row in A the vector is contained in.

alpha - scale factor of A

B - submatrix. Not modified.

rowB - which row in B the vector is contained in.

beta - scale factor of B

C - submatrix where the results are written to. Modified.

rowC - which row in C is the vector contained.

offset - Index at which the vectors start at.

end - Index at which the vectors end at.

dot_row

public static double dot_row(int blockLength,
                             D1Submatrix64F A,
                             int rowA,
                             D1Submatrix64F B,
                             int rowB,
                             int offset,
                             int end)

Row vector dot/inner product:
dot: c = sum a_i*b_i
where 'a' and 'b' are row vectors within the row block vector A and B, and 'c' is a scalar.

Parameters:

A - submatrix. Not modified.

rowA - which row in A the vector is contained in.

B - submatrix. Not modified.

rowB - which row in B the vector is contained in.

offset - Index at which the vectors start at.

end - Index at which the vectors end at.

Returns:

Results of the dot product.

dot_row_col

public static double dot_row_col(int blockLength,
                                 D1Submatrix64F A,
                                 int rowA,
                                 D1Submatrix64F B,
                                 int colB,
                                 int offset,
                                 int end)

vector dot/inner product from one row vector and one column vector:
dot: c = sum a_i*b_i
where 'a' is a row vector 'b' is a column vectors within the row block vector A and B, and 'c' is a scalar.

Parameters:

A - block row vector. Not modified.

rowA - which row in A the vector is contained in.

B - block column vector. Not modified.

colB - which column in B is the vector contained in.

offset - Index at which the vectors start at.

end - Index at which the vectors end at.

Returns:

Results of the dot product.