Abstract
During the last decades, research efforts have been focused on the derivation of effective explicit preconditioned iterative methods. In this manuscript, we review the Explicit Preconditioned Conjugate Gradient Least Squares method, based on generic sparse approximate pseudoinverses, in conjunction with approximate pseudoinverse sparsity patterns, based on the modified row-threshold incomplete QR factorization techniques. Additionally, modified Moore-Penrose conditions are presented, and theoretical estimates for the sensitivity of the generic approximate sparse pseudoinverses are derived. Finally, numerical results concerning the generic approximate sparse pseudoinverses by solving characteristic model problems are given. The theoretical estimates were in qualitative agreement with the numerical results.
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The authors acknowledge the Greek Research and Technology Network (GRNET) for the provision of the National HPC facility ARIS under project PR004033-ScaleSciCompII and PR006053-ScaleSciCompIII.
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Lipitakis, A.D., Gravvanis, G.A., Filelis-Papadopoulos, C.K., Anagnostopoulos, D. (2021). A Note on the Sensitivity of Generic Approximate Sparse Pseudoinverse Matrix for Solving Linear Least Squares Problems. In: Arabnia, H.R., et al. Advances in Parallel & Distributed Processing, and Applications. Transactions on Computational Science and Computational Intelligence. Springer, Cham. https://doi.org/10.1007/978-3-030-69984-0_21
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