[petsc-users] zero diagonal values and Jacobi preconditioner

[Dominik Szczerba]

Jacobi...

On Tue, Nov 15, 2011 at 1:22 PM, Matthew Knepley <knepley at gmail.com> wrote:
> 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
>