On Tue, Nov 15, 2011 at 6:33 AM, Dominik Szczerba <span dir="ltr"><<a href="mailto:dominik@itis.ethz.ch">dominik@itis.ethz.ch</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Jacobi...<br></blockquote><div><br></div><div><a href="http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/PC/PCJACOBI.html">http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/PC/PCJACOBI.html</a></div>
<div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
On Tue, Nov 15, 2011 at 1:22 PM, Matthew Knepley <<a href="mailto:knepley@gmail.com">knepley@gmail.com</a>> wrote:<br>
> On Tue, Nov 15, 2011 at 5:17 AM, Dominik Szczerba <<a href="mailto:dominik@itis.ethz.ch">dominik@itis.ethz.ch</a>><br>
> wrote:<br>
>><br>
>> What will happen if my matrix has (close to, or exactly) zeros on the<br>
>> diagonal? Does Petsc handle such cases smartly somehow or am I right<br>
>> to expect poor convergence (values close to zero) or failure (values<br>
>> exactly zero)?<br>
><br>
> It would depend on what preconditioner you are using.<br>
> Matt<br>
><br>
>><br>
>> Many thanks,<br>
>> Dominik<br>
><br>
><br>
><br>
> --<br>
> What most experimenters take for granted before they begin their experiments<br>
> is infinitely more interesting than any results to which their experiments<br>
> lead.<br>
> -- Norbert Wiener<br>
><br>
</blockquote></div><br><br clear="all"><div><br></div>-- <br>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>
-- Norbert Wiener<br>