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On finding robust approximate inverses for large sparse matrices
Authors:Fazlollah Soleymani
Institution:1. Department of Mathematics, Islamic Azad University, Zahedan Branch, Zahedan, Iran.fazl_soley_bsb@yahoo.com
Abstract:This paper presents a method based on matrix-matrix multiplication concepts for determining the approximate (sparse) inverses of sparse matrices. The suggested method is a development on the well-known Schulz iteration and it can successfully be combined with iterative solvers and sparse approximation techniques as well. A detailed discussion on the convergence rate of this scheme is furnished. Results of numerical experiments are also reported to illustrate the performance of the proposed method.
Keywords:sparse matrices  matrix inversion  Schulz method  approximate inverse
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