Abstract
We analyze controllability properties of the inverse iteration and the QR-algorithm equipped with a shifting parameter as a control input. In the case of the inverse iteration with real shifts the theory of universally regular controls may be used to obtain necessary and sufficient conditions for complete controllability in terms of the solvability of a matrix equation. Partial results on conditions for the solvability of this matrix equation are given. We discuss an interpretation of the system in terms of control systems on rational functions. Finally, first results on the extension to inverse Rayleigh iteration on Grassmann manifolds using complex shifts is discussed.
This paper was written while Fabian Wirth was a guest at the Centre Automatique et Systèmes, Ecole des Mines de Paris, Fontainebleau, France. The hospitality of all the members of the centre is gratefully acknowledged.
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Helmke, U., Wirth, F. (2001). Controllability properties of numerical eigenvalue algorithms. In: Isidori, A., Lamnabhi-Lagarrigue, F., Respondek, W. (eds) Nonlinear control in the Year 2000. Lecture Notes in Control and Information Sciences, vol 258. Springer, London. https://doi.org/10.1007/BFb0110234
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DOI: https://doi.org/10.1007/BFb0110234
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