Addendum to "A Krylov--Schur Algorithm for Large Eigenproblems"
G. W. Stewart · SIAM Journal on Matrix Analysis and Applications · 2002
In this addendum to an earlier paper by the author, it is shown how to compute a Krylov decomposition corresponding to an arbitrary Rayleigh quotient. This decomposition can be used to restart an Arnoldi process, with a selection of the Ritz vectors corresponding to that Rayleigh quotient.