Graph centers used for stabilization of matrix factorizations

• Autorzy: Pavla Kabelíková
• Języki publikacji: EN

Abstrakty

EN

Systems of consistent linear equations with symmetric positive semidefinite matrices arise naturally while solving many scientific and engineering problems. In case of a "floating" static structure, the boundary conditions are not sufficient to prevent its rigid body motions.
Traditional solvers based on Cholesky decomposition can be adapted to these systems by recognition of zero rows or columns and also by setting up a well conditioned regular submatrix of the problem that is used for implementation of a generalised inverse. Conditioning such a submatrix seems to be related with detection of so called fixing nodes such that the related boundary conditions make the structure as stiff as possible. We can consider the matrix of the problem as an unweighted non-oriented graph. Now we search for nodes that stabilize the solution well-fixing nodes (such nodes are sufficiently far away from each other and are not placed near any straight line). The set of such nodes corresponds to one type of graph center.

Słowa kluczowe

EN

FETI; parallel computing; generalised inverse; graph center

Kategorie tematyczne

• 05C12: Distance in graphs
• 05C50: Graphs and linear algebra (matrices, eigenvalues, etc.)
• 90C35: Programming involving graphs or networks

• Wydawca: De Gruyter Open
• Czasopismo: Discussiones Mathematicae Graph Theory
• Rocznik: 2010
• Tom: 30
• Numer: 2
• Strony: 249-259

Daty

wydano

2010

otrzymano

2008-12-31

poprawiono

2009-09-30

zaakceptowano

2009-11-09

Twórcy

autor

Pavla Kabelíková

• Department of Applied Mathematics, FEI, VSB - Technical University of Ostrava, 17. listopadu 15, 708 33, Ostrava-Poruba, Czech Republic

Bibliografia

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Identyfikatory

DOI

10.7151/dmgt.1498