Optimal Conditioning in the Convex Class of Rank Two Updates

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Abstract
Davidson's new quasi-Newton optimization algorithm selects the new inverse Hessian approximation H at each step to be the "optimally conditioned" member of a certain one-parameter class of rank two updates to the last inverse Hessian approximation H. In this paper, we show that virtually the same goals of conditioning can be achieved while restricting H to the convex class of updates. We therefore suggest that Davidson's algorithms using optimal conditioning, restrict the choice of H to members of the convex class.
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1976-08
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Cornell University
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computer science; technical report
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http://techreports.library.cornell.edu:8081/Dienst/UI/1.0/Display/cul.cs/TR76-288
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technical report
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