Approximate inverse preconditioners for some large dense random electrostatic interaction matrices
Author
Summary, in English
A sparse mesh-neighbour based approximate inverse preconditioner is proposed for a type of dense matrices whose entries come from the evaluation of a slowly decaying free space Green's function at randomly placed points in a unit cell. By approximating distant potential fields originating at closely spaced sources in a certain way, the preconditioner is given properties similar to, or better than, those of a standard least squares approximate inverse preconditioner while its setup cost is only that of a diagonal block approximate inverse preconditioner. Numerical experiments on iterative solutions of linear systems with up to four million unknowns illustrate how the new preconditioner drastically outperforms standard approximate inverse preconditioners of otherwise similar construction, and especially so when the preconditioners are very sparse.
Department/s
- Mathematics (Faculty of Engineering)
- Harmonic Analysis and Applications
Publishing year
2006
Language
English
Pages
307-323
Publication/Series
BIT Numerical Mathematics
Volume
46
Issue
2
Full text
Links
Document type
Journal article
Publisher
Springer
Topic
- Mathematics
Keywords
- dense matrices
- preconditioners
- sparse approximate
- inverses
- potential theory
- iterative methods
- integral equations
Status
Published
Research group
- Harmonic Analysis and Applications
- Harmonic Analysis and Applications
ISBN/ISSN/Other
- ISSN: 0006-3835