Struct GramMatrix 

pub struct GramMatrix { /* private fields */ }

A Gram matrix (symmetric kernel matrix) wrapper.

Wraps an Array2<f64> that is expected to be square and symmetric, providing convenient accessors for common operations.

Implementations

impl GramMatrix

pub fn new(data: Array2<f64>) -> Result<Self>

Create a new Gram matrix, verifying that it is square.

pub fn get(&self, i: usize, j: usize) -> f64

Get entry (i, j).

pub fn dim(&self) -> usize

Matrix dimension (n for an n x n matrix).

pub fn diagonal(&self) -> Vec<f64>

Diagonal entries as a vector.

pub fn trace(&self) -> f64

Matrix trace (sum of diagonal entries).

pub fn is_symmetric(&self, tol: f64) -> bool

Check if the matrix is approximately symmetric within a given tolerance.

pub fn has_nonneg_diagonal(&self) -> bool

Check if all diagonal entries are non-negative (necessary condition for PSD).

pub fn frobenius_norm(&self) -> f64

Frobenius norm: sqrt(sum of squares of all entries).

pub fn as_array(&self) -> &Array2<f64>

Access the underlying array.

Trait Implementations

impl Clone for GramMatrix

fn clone(&self) -> GramMatrix

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for GramMatrix

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

Formats the value using the given formatter.