[petsc-users] Gauss-Seidel

[tribur]

Thanks a lot!

Am 24.04.2012 03:42, schrieb Jed Brown:
> On Mon, Apr 23, 2012 at 20:40, tribur <burckhardt at itis.ethz.ch [4]>
> wrote:
>
>> Hi Jed,
>>
>> Thanks for the ultra fast response.
>>
>> Apart from the nonzero initial guess, is -ksp_type preonly -pc_type
>> sor -pc_sor_its 10 right?
>
> Yes.
>
> You can use -ksp_initial_guess_nonzero -ksp_type richardson
>  
>
>> Am 24.04.2012 03 [3]:29, schrieb Jed Brown:
>>
>>> On Mon, Apr 23, 2012 at 20:27, tribur <burckhardt at itis.ethz.ch [1]
>>> [1]>
>>>
>>> wrote:
>>>
>>>> I would like to do 10 iterations of a point-by-point
>>>> Gauss-Seidel
>>>> procedure for the purpose of testing.
>>>>
>>>> Is it correct if I type "mpiexec -n 1 ... -ksp_type preonly
>>>> -pc_type sor -pc_sor_its 10"?
>>>>
>>>> How can I define the initial guess nonzero?
>>>
>>> With a nonzero initial guess, you are doing Richardson (not
>>> preonly).
>>> You can set the nonzero initial guess as usual
>>> (KSPSetInitialGuessNonzero()).
>>>
>>> Links:
>>> ------
>>> [1] mailto:burckhardt at itis.ethz.ch [2]
>
>
>
> Links:
> ------
> [1] mailto:burckhardt at itis.ethz.ch
> [2] mailto:burckhardt at itis.ethz.ch
> [3] http://webmail.oetiker.ch/tel:24.04.2012%2003
> [4] mailto:burckhardt at itis.ethz.ch