[petsc-users] zero diagonal values and Jacobi preconditioner

[Matthew Knepley]

On Tue, Nov 15, 2011 at 5:17 AM, Dominik Szczerba <dominik at itis.ethz.ch>wrote:

> What will happen if my matrix has (close to, or exactly) zeros on the
> diagonal? Does Petsc handle such cases smartly somehow or am I right
> to expect poor convergence (values close to zero) or failure (values
> exactly zero)?
>

It would depend on what preconditioner you are using.

   Matt


> Many thanks,
> Dominik
>



-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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