[petsc-users] dense matrix problem

[Alex Salazar]

Thanks Matthew !,  It sound very interesting I going to check it.

Regard Alex...




2013/1/31 Matthew Knepley <knepley at gmail.com>

> 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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