## Numerical experiments with two approximate inverse preconditioners.(English)Zbl 0909.65027

The solution of a large and sparse system of linear equations $$Ax=b$$ by iterative technique combined with preconditioner is considered. There is interest in an alternative form of preconditioning based on approximating the matrix inverse $$A^{-1}$$. With this kind of preconditioner the computation can be performed in parallel.
The most popular approach to approximate inverse preconditioning – the SPAI algorithm – is based on the idea of Frobenius norm minimization. Another approach for computing a factorized approximate inverse, suggested by the authors, is based on incomplete biconjugation. For general sparse matrices it is very difficult to prescribe the sparsity pattern in advance and so SPAI becomes very expensive. The construction of the AINV preconditioner does not require that the sparsity pattern be known in advance, and applicable to general sparse matrices.
The authors present the results of numerical experiments aimed at comparing SPAI and AINV, performed on a set of sparse matrices. Results for a standard ILU preconditioner are also included. From the point of view of robustness and rates of convergence, SPAI and AINV are comparable and AINV is somewhat better on average.

### MSC:

 65F35 Numerical computation of matrix norms, conditioning, scaling 65F10 Iterative numerical methods for linear systems 65F50 Computational methods for sparse matrices

### Software:

Harwell-Boeing sparse matrix collection; ISIS++
Full Text:

### References:

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