Struct DmrgStepRecord 

pub struct DmrgStepRecord<R> {
    pub sweep: usize,
    pub direction: SweepDirection,
    pub site: usize,
    pub eigenvalue: R,
    pub residual: R,
    pub trunc_err: R,
    pub bond_dim: usize,
    pub eigensolver_iters: usize,
    pub eigensolver_converged: bool,
}

Per-step diagnostics record.

Fields

sweep: usize

Index of the sweep cycle this step belongs to.

direction: SweepDirection

Direction of the half-sweep (L→R or R→L).

site: usize

Left site of the optimized two-site block.

eigenvalue: R

Smallest eigenvalue of H_eff at this step (pre-truncation local-block variational minimum). May lie below the post-truncation sweep energy.

residual: R

Local-eigensolver true residual ‖H v − λ v‖₂.

trunc_err: R

Frobenius norm of singular values discarded by this step’s truncated SVD.

bond_dim: usize

New bond dimension between site and site + 1 after the truncated split.

eigensolver_iters: usize

Number of iterations the local eigensolver ran for this step. For Lanczos this is the inner loop count; for ARPACK it is the restart-iteration count returned in iparam[2].

eigensolver_converged: bool

true iff the local eigensolver succeeded — Lanczos by its absolute true-residual test against LanczosParams::tol, ARPACK by its relative-tol stopping criterion (i.e. Ok return from arpack_smallest). The two arms intentionally disagree on what they call “converged”: Lanczos uses the absolute residual; ARPACK uses residual <= tol * |lambda|. See super::heff::TwoSiteStepResult::converged for the upstream contract this field forwards from.

Trait Implementations

impl<R: Clone> Clone for DmrgStepRecord<R>

fn clone(&self) -> DmrgStepRecord<R>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<R: Debug> Debug for DmrgStepRecord<R>

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

Formats the value using the given formatter.