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Geometrical inverse preconditioning for symmetric positive definite matrices. (English) Zbl 1360.65093

Summary: We focus on inverse preconditioners based on minimizing \(F(X)=1-\cos(XA,I)\), where \(XA\) is the preconditioned matrix and \(A\) is symmetric and positive definite. We present and analyze gradient-type methods to minimize \(F(X)\) on a suitable compact set. For this, we use the geometrical properties of the non-polyhedral cone of symmetric and positive definite matrices, and also the special properties of \(F(X)\) on the feasible set. Preliminary and encouraging numerical results are also presented in which dense and sparse approximations are included.

MSC:

65F08 Preconditioners for iterative methods

References:

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