The structured distance to normality of Toeplitz matrices with application to preconditioning
Silvia Noschese, Lothar Reichel · Numerical Linear Algebra with Applications · 2010
A formula for the distance of a Toeplitz matrix to the subspace of {eiϕ}-circulant matrices is presented, and applications of {eiϕ}-circulant matrices to preconditioning of linear systems of equations with a Toeplitz matrix are discussed. Copyright © 2010 John Wiley & Sons, Ltd.