# DMGT

ISSN 1234-3099 (print version)

ISSN 2083-5892 (electronic version)

# IMPACT FACTOR 2018: 0.741

SCImago Journal Rank (SJR) 2018: 0.763

Rejection Rate (2018-2019): c. 84%

# Discussiones Mathematicae Graph Theory

## GRAPH CENTERS USED FOR STABILIZATION OF MATRIX FACTORIZATIONS

Pavla Kabelíková

Department of Applied Mathematics
FEI, VSB - Technical University of Ostrava
17. listopadu 15, 708 33, Ostrava-Poruba, Czech Republic
e-mail: pavla.kabelikova@vsb.cz

## Abstract

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.

Keywords: FETI, parallel computing, generalised inverse, graph center.

2010 Mathematics Subject Classification: 05C12, 05C50, 90C35.

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