On the Conditioning of Pole Assignment

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On the Conditioning of Pole Assignment
James Demmel
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Changing basis with P yields the result. Q. E. D.
Now suppose the pair (A, 5) is controllable, and that the closest uncontrollable pair is (A^^J. Here we measure distance using the unitarily invariant absolute norm D.. - A -A + \B. -B\ llflllr (4) 2« ^«ll~^m •^«12 A„i3 ^. 21 A^22-'>^m-n-r ^u23 Bi A31 A32 Kii-K where ||I|;r denotes the Frobenius norm. Choose P and C as in (3) above to put the pendl [B \A - X7] into the indicated form. The next lemma describes the form of P^[B \A-\I]Q: Lemma 3: P
...^[B \A->J]Q = Furthermore, only the last rows of B^, A^j and A^j axe nonzero. Note that only the three blocks at the bottom left differ iroir j;-3;.
Proof: Suppose, to the contrary, that feere were differences outside the three blocks B^, Aji and Aj2- ^^* would contradic! the definition of (iA„3„) as being the closest uncontrollable pencil to (A^) since by making P^[A^^^]Q agree with P'''[A\B]Q outside these three blocks we could find an uncontrollable pair even closer to (A^). Similarly, if B^, A31 and A32 had nonzero entries elsewhere than in their last rows, we could find an uncontrollable pair closer to (A^B) than (A, 5„) by making P'''[A^\BjQ agree with P^[A \B]Q outside the last rows of B^, A^^, and A32.


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