Abstract
Numerical matrix eigenvalue methods such as the inverse power iteration or the QR-algorithm can be reformulated as inverse power iterations on homogeneous spaces. In this paper we survey some recent results on controllability properties of the shifted inverse power iteration on flag manifolds. It is shown that the reachable sets are orbits for a semigroup action on the flag manifold. Except for the special case of projective spaces, the algorithm is never controllable. This implies in particular the non-controllability of the shifted QR-algorithm on isospectral matrices. Controllability results for the inverse power iteration on projective space for real or complex shifts are presented, following [20, 22], and a connection with output feedback pole assignability is mentioned. Controllability of the algorithm on Hessenberg flags is shown. This implies controllability of the shifted QR-algorithm on Hessenberg matrices.
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Helmke, U., Jordan, J. (2003). Numerics Versus Control. In: Rosenthal, J., Gilliam, D.S. (eds) Mathematical Systems Theory in Biology, Communications, Computation, and Finance. The IMA Volumes in Mathematics and its Applications, vol 134. Springer, New York, NY. https://doi.org/10.1007/978-0-387-21696-6_7
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DOI: https://doi.org/10.1007/978-0-387-21696-6_7
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