Struct BlockSparsityPattern 

pub struct BlockSparsityPattern {
    pub nblock_rows: usize,
    pub nblock_cols: usize,
    pub pattern: Vec<Vec<bool>>,
}

Binary pattern showing which blocks of a BSR tensor are non-zero.

This is useful for structural analysis (symmetry detection, diagonal coverage, bandwidth estimation) without loading the actual block data.

Fields

nblock_rows: usize

Number of block-rows.

nblock_cols: usize

Number of block-columns.

pattern: Vec<Vec<bool>>

pattern[br][bc] is true iff block (br, bc) is stored.

Implementations

impl BlockSparsityPattern

pub fn from_tensor(tensor: &BlockedSparseTensor) -> Self

Derive the sparsity pattern from a BSR tensor.

pub fn density(&self) -> f64

Fraction of blocks that are non-zero.

pub fn is_symmetric(&self) -> bool

Returns true if the block pattern is square and symmetric, i.e. pattern[i][j] == pattern[j][i] for all valid (i, j).

pub fn has_diagonal_blocks(&self) -> bool

Returns true if every diagonal block (i, i) is present.

Only meaningful for square block patterns.

pub fn to_ascii(&self) -> String

Render the sparsity pattern as an ASCII string.

'#' represents a non-zero block; '.' represents a zero block. Each block-row occupies one text line.

Trait Implementations

impl Clone for BlockSparsityPattern

fn clone(&self) -> BlockSparsityPattern

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for BlockSparsityPattern

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.