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ztdep August 10, 2008 14:45

GMRES method .vs. bcg stab
Dear friends:

I want to know , GMRES and BI_CG_STAB, which is more better. regards

Jed August 12, 2008 06:28

Re: GMRES method .vs. bcg stab
It depends on your equations, discretization, and preconditioner. You should try both (maybe (TF)QMR as well) with a selection of preconditioners. For most combinations from the following table, there is a matrix for which that combination is significantly better than the others. GMRES is pretty robust and makes a good default.

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