# Stochastic matrices and $L_{p}$ norms: new algorithms for solving ill-conditioned linear systems of equations

Abstract : We propose new iterative algorithms for solving a system of linear equations, possibly singular and inconsistent, presenting outstanding performances regarding ill-conditioning and error propagation. The basis of our approach is constructing with the l1 norm, a preconditioning matrix C (an approximation of a generalized inverse of the matrix) such that the preconditioned matrix CA is stochastic. This property allows us to retrieve, in an original way, the Schultz-Hotelling-Bodewig's algorithm of iterative refinement of the approximate inverse of a matrix. The approach, valid for non-negative matrices, is then generalized to any complex, rectangular matrix. We are then able to compute a generalized inverse of any matrix and this inverse is fit for use in classical solving schemes such as : Richardson-Tanabe, Schultz-Hotelling-Bodewig, preconditioned conjugate gradients and also in the Kaczmarz scheme (that we have generalized using lp norms). Regarding the obtained results on pathological well-known test-cases such as Hilbert and Nakasaka matrices, some of the proposed algorithms are empirically shown to be more efficient than the known classical techniques.
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https://hal-supelec.archives-ouvertes.fr/hal-01107461
Contributor : Marc Lambert <>
Submitted on : Tuesday, January 20, 2015 - 5:19:53 PM
Last modification on : Saturday, May 1, 2021 - 3:41:12 AM

### Citation

Riadh Zorgati, Wim van Ackooij, Marc Lambert. Stochastic matrices and $L_{p}$ norms: new algorithms for solving ill-conditioned linear systems of equations. ESAIM: Proceedings and Surveys, 18, EDP Sciences, pp.70 - 86, 2007, 2267-3059. ⟨10.1051/proc:071807⟩. ⟨hal-01107461⟩

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