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ML(n) BiCGStab: Reformulation, Analysis and Implementation*

Published online by Cambridge University Press:  28 May 2015

Man-Chung Yeung*
Affiliation:
Department of Mathematics, University of Wyoming, Laramie, WY 82071, USA
*
Corresponding author.Email address:myeung@uwyo.edu
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Abstract

With the aid of index functions, we re-derive the ML(n)BiCGStab algorithm in [Yeung and Chan, SIAM J. Sci. Comput., 21 (1999), pp. 1263-1290] systematically. There are n ways to define the ML(n)BiCGStab residual vector. Each definition leads to a different ML(n)BiCGStab algorithm. We demonstrate this by presenting a second algorithm which requires less storage. In theory, this second algorithm serves as a bridge that connects the Lanczos-based BiCGStab and the Arnoldi-based FOM while ML(n)BiCG is a bridge connecting BiCG and FOM. We also analyze the breakdown situation from the probabilistic point of view and summarize some useful properties of ML(n)BiCGStab. Implementation issues are also addressed.

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Type
Research Article
Copyright
Copyright © Global Science Press Limited 2012

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