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Published online by Cambridge University Press: 28 May 2015
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.
Dedicated to the Memory of Prof. Gene Golub. This paper was presented in Gene Golub Memorial Conference, Feb. 29-Mar. 1, 2008, at University of Massachusetts. This research was supported by 2008 Flittie Sabbatical Augmentation Award, University of Wyoming.