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- Andreas Frommer, Bert Pohl
- Numerical Lin. Alg. with Applic.
- 1995

We show that certain multisplitting iterative methods based on overlapping blocks yield faster convergence than corresponding nonoverlapping block iterations, provided the coefficient matrix is an M-matrix. This result can be used to compare variants of the waveform relaxation algorithm for solving initial value problems. The methods under consideration use… (More)

- Rolf Jeltsch, Bert Pohl
- SIAM J. Scientific Computing
- 1995

This paper presents a new preconditioning technique for the restarted GMRES algorithm. It is based on an invariant subspace approximation which is updated at each cycle. Numerical examples show that this deea-tion technique gives a more robust scheme than the restarted algorithm, at a low cost of operations and memory.

- Kevin Burrage, Jocelyne Erhel, Bert Pohl, Alan Williams
- SIAM J. Scientific Computing
- 1998

Iterative methods for solving linear systems of equations can be very eecient if the structure of the coeecient matrix can be exploited to accelerate the convergence of the iterative process. However, for classes of problems for which suitable preconditioners cannot be found or for which the iteration scheme does not converge, iterative techniques may be… (More)

- Kevin Burrage, Bert Pohl
- 1994

1 Abstract In this paper it is shown how to adapt an existing package (VODE) for solving systems of ordinary diierential equations on serial computers to distributed memory parallel computers. The approach taken is based on waveform relaxation in which the problem is decomposed into a sequence of subproblems and which are then solved independently using… (More)

- Lawrence Lau, Mike Rezny, John Belward, Kevin Burrage, Bert Pohl
- CONPAR
- 1994

- Bert Pohl
- 1992

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