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URN: urn:nbn:de:0030-drops-7806
URL: http://drops.dagstuhl.de/opus/volltexte/2006/780/
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Watt, Stephen M.

Pivot-Free Block Matrix Inversion

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Abstract

We present a pivot-free deterministic algorithm for the inversion of block matrices. The method is based on the Moore-Penrose inverse and is applicable over certain general classes of rings. This improves on previous methods that required at least one invertible on-diagonal block, and that otherwise required row- or column-based pivoting, disrupting the block structure. Our method is applicable to any invertible matrix and does not require any particular blocks to invertible. This is achieved at the cost of two additional specialized matrix multiplications and, in some cases, requires the inversion to be performed in an extended ring.

BibTeX - Entry

@InProceedings{watt:DSP:2006:780,
  author =	{Stephen M. Watt},
  title =	{Pivot-Free Block Matrix Inversion},
  booktitle =	{Challenges in Symbolic Computation Software},
  year =	{2006},
  editor =	{Wolfram Decker and Mike Dewar and Erich Kaltofen and Stephen Watt },
  number =	{06271},
  series =	{Dagstuhl Seminar Proceedings},
  ISSN =	{1862-4405},
  publisher =	{Internationales Begegnungs- und Forschungszentrum f{\"u}r Informatik (IBFI), Schloss Dagstuhl, Germany},
  address =	{Dagstuhl, Germany},
  URL =		{http://drops.dagstuhl.de/opus/volltexte/2006/780},
  annote =	{Keywords: Linear algebra, block matrices, matrix inverse}
}

Keywords: Linear algebra, block matrices, matrix inverse
Seminar: 06271 - Challenges in Symbolic Computation Software
Issue Date: 2006
Date of publication: 02.11.2006


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