Struct LazyMatrixSource 

pub struct LazyMatrixSource<T: Scalar, F> { /* private fields */ }

Callback-backed lazy matrix source.

Evaluates matrix blocks on demand via a user-supplied closure, avoiding full materialization. The closure fills a column-major output buffer for a given set of rows and columns.

Implementations

impl<T: Scalar, F> LazyMatrixSource<T, F>

where F: Fn(&[usize], &[usize], &mut [T]),

pub fn new(nrows: usize, ncols: usize, fill_block: F) -> Self

Create a lazy source from a block-fill callback.

Trait Implementations

impl<T: Scalar, F> CandidateMatrixSource<T> for LazyMatrixSource<T, F>

where F: Fn(&[usize], &[usize], &mut [T]),

fn nrows(&self) -> usize

Number of rows.

fn ncols(&self) -> usize

Number of columns.

fn get_block(&self, rows: &[usize], cols: &[usize], out: &mut [T])

Fill out with the cross-product A[rows, cols] in column-major order.

fn dense_column_major_slice(&self) -> Option<&[T]>

Borrow the whole matrix in column-major layout when available.

fn get(&self, row: usize, col: usize) -> T

Read a single matrix entry.