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A Polynomial Preconditioner for the CMRH Algorithm

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  • Jiangzhou Lai
  • Linzhang Lu
  • Shiji Xu

Abstract

Many large and sparse linear systems can be solved efficiently by restarted GMRES and CMRH methods Sadok 1999. The CMRH(m) method is less expensive and requires slightly less storage than GMRES(m). But like GMRES, the restarted CMRH method may not converge. In order to remedy this defect, this paper presents a polynomial preconditioner for CMRH-based algorithm. Numerical experiments are given to show that the polynomial preconditioner is quite simple and easily constructed and the preconditioned CMRH(m) with the polynomial preconditioner has better performance than CMRH(m).

Suggested Citation

  • Jiangzhou Lai & Linzhang Lu & Shiji Xu, 2011. "A Polynomial Preconditioner for the CMRH Algorithm," Mathematical Problems in Engineering, Hindawi, vol. 2011, pages 1-12, March.
    • Handle: RePEc:hin:jnlmpe:545470
    DOI: 10.1155/2011/545470
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