Non-nested block low-rank matrix. More...

#include <starsh.h>

Collaboration diagram for starsh_blrm:

Data Fields
STARSH_blrf *	format
	Pointer to block low-rank format.

int *	far_rank
	Rank of each far-field block.

Array **	far_U
	Low rank factor of each far-field block. More...

Array **	far_V
	Low rank factor of each far-field block. More...

int	onfly
	Equal to `1` to store dense blocks, `0` to compute it on demand.

Array **	near_D
	Array of pointers to dense near-field blocks.

void *	alloc_U
	Pointer to memory buffer, holding all `far_U`.

void *	alloc_V
	Pointer to memory buffer, holding all `far_V`.

void *	alloc_D
	Pointer to memory buffer, holding all `near_D`.

char	alloc_type
	Type of memory allocation. More...

size_t	nbytes
	Total size of block low-rank matrix, including auxiliary buffers.

size_t	data_nbytes
	Size of low-rank factors and dense blocks in block low-rank matrix.

Detailed Description

Non-nested block low-rank matrix.

Stores approximation or dense form of each admissible blocks.Division into blocks is defined by corresponding block low-rank format.

Field Documentation

◆ alloc_type

char starsh_blrm::alloc_type

Type of memory allocation.

Equal to 1 if allocating 3 big buffers U_alloc, V_alloc and D_alloc; 2 if allocating many small buffers for each far_U, far_V and near_D.

◆ far_U

Array** starsh_blrm::far_U

Low rank factor of each far-field block.

Multiplication of far_U[i] by transposed far_V[i] is an approximation of i-th far-field block.

◆ far_V

Array** starsh_blrm::far_V