pub fn eigsh_with_workspace<O>(
operator: &O,
options: EigshOptions,
workspace: &mut EigshWorkspace,
) -> Result<Eigensystem>where
O: LinearOperator + ?Sized,Expand description
Solve one member of a related operator family and update its reusable invariant-subspace workspace.
A compatible workspace retains all previously converged vectors. Small restart windows preserve them as a thick subspace; the cheaper large-window tridiagonal route forms a balanced warm start without replacing the generic Lanczos algorithm.