[petsc-users] dense matrix problem

[Matthew Knepley]

On Thu, Jan 31, 2013 at 11:07 AM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> "result is incorrect" is not helpful. Please include diagnostics. Are you
> using an iterative or direct solver? Start here if you don't know what to
> check:
>
>
> http://scicomp.stackexchange.com/questions/513/why-is-my-iterative-linear-solver-not-converging
>

And ASM works great for these problems:

   http://arxiv.org/abs/0909.5413

       Matt


>
> On Thu, Jan 31, 2013 at 9:58 AM, Alex Salazar <alejandrocof at gmail.com>wrote:
>
>> Hello, everyone
>>
>> I want to get the solution of algrebraic system (with a  dense
>> zero-diagonal simetric matrix) of a interpolation problem (using radial
>> basis functions) with Petsc.
>>
>>  For a few points (around 10 elements) using KSP I get the correct
>> solution,  however when  I increase the number of points,  the result is
>> incorrect.
>>
>> Any Idea ?
>>
>> Regards Alejandro.
>>
>>
>


-- 
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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