Journal of Computational and Applied Mathematics vol:189 issue:1-2 pages:157-178
In an earlier paper we introduced the classes of polynomial and rank structures, both of them preserved by applying, a (shifted) QR-step on a matrix A. In the present paper we further investigate the case of rank structures. We show that even if A is a singular matrix, a new QR-iterate can be constructed having the same rank structure as the matrix A itself. To this end we introduce the concepts of effectively eliminating QR-decompositions and sparse Givens patterns, both of them being of independent interest. (c) 2005 Elsevier B.V. All rights reserved.