[petsc-users] Could you please give me some advice for the following error

[Matthew Knepley]

On Wed, Sep 4, 2013 at 10:34 AM, 丁老师 <ztdepyahoo at 163.com> wrote:

>  the input parameter of this partation is the drow and dcol.
> could you please tell me how to resolve this problem.
>
>
> MatCreateMPIAdj(PETSC_COMM_WORLD,drow.size()-1,CellsNumber,&drow[0],&dcol[0],NULL,&adj);
>

Graph partitioners like ParMetis partition undirected graphs. They are not
suitable for directed graphs, which is what
a nonsymmetric matrix corresponds to. I do not know what you should do here.

   Matt


> 在 2013-09-04 23:25:38，"Matthew Knepley" <knepley at gmail.com> 写道：
>
> On Wed, Sep 4, 2013 at 10:23 AM, 丁老师 <ztdepyahoo at 163.com> wrote:
>
>> yes, i am computing convection diffusion problem with a  triangle
>> unstructured grid. the matrix coefficients is unsymemetric.
>> but is it a necessary for the parmetis to do the work?
>>
>
> The matrix can be nonsymmetric, but it has to be structurally symmetric.
>
>    Matt
>
>
>> 在 2013-09-04 23:20:47，"Mark F. Adams" <mfadams at lbl.gov> 写道：
>>
>> My guess is that your matrix is structurally unsymmetric.
>>
>> On Sep 4, 2013, at 11:16 AM, 丁老师 <ztdepyahoo at 163.com> wrote:
>>
>>  1] ***ASSERTION failed on line 243 of file
>> /home/ztdep/Downloads/petsc-3.3-p6/externalpackages/parmetis-4.0.2-p3/libparmetis/match.c:k
>> >= firstvtx && k < lastvtx
>> [ 1] 2562 5124 10 0 0
>> main:
>> /home/ztdep/Downloads/petsc-3.3-p6/externalpackages/parmetis-4.0.2-p3/libparmetis/match.c:243:
>> libparmetis__Match_Global: Assertion `k >= firstvtx && k < lastvtx' failed.
>>
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> --
> 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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>
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-- 
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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