[petsc-users] about pclu

[Matthew Knepley]

On Tue, Apr 5, 2011 at 9:52 PM, Ryan Yan <vyan2000 at gmail.com> wrote:

> Hi,
> I am wondering is there a way of checking the residual of a direct solver.
> It should
> be one shot and very small.  I tried -ksp_monitor_true_residual, but no
> thing shows up. I guess a piece of code
> $Ax-b$ will do the trick?
>

If you use it through KSPSolve, then -ksp_monitor will give you the
residual.

   Matt


> Thanks,
>
> Yan
>



-- 
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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