Some strange results running in PETSc.

[Matthew Knepley]

It appears there is a problem in your output code. Why not just use PETSC
output?

  Matt

On Wed, Apr 29, 2009 at 10:18 PM, (Rebecca) Xuefei YUAN <xy2102 at columbia.edu
> wrote:

> Hi,
>
> I am running some codes and stores the solution in the text file. However,
> I found that some results are wired in the sense that some processors are
> "eating" my (i,j) index and the corresponding solution.
>
> For example, the solution at time step =235 on processor 6 is right, but at
> time step = 236 on processor 6, one grid solution is missing and thus the
> order of the index is wrong.
>
> In the attached two files:
> hp.solution.dt0.16700.n90.t235.p6 (right one)
> hp.solution.dt0.16700.n90.t236.p6 (wrong one)
> for example,
>
> in hp.solution.dt0.16700.n90.t235.p6 (right one)
> i      j
>
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------
> 50 14 3.3212491928636803e-02 7.2992225179014901e-03 2.9841295384404947e+00
> 2.2004855368148415e-02
> 51 14 4.0287965701667774e-02 2.5401878231124070e-03 2.9201873761746322e+00
> 2.6251864239477816e-02
> 52 14 4.7084950235070790e-02 -1.5367647745423544e-03 2.8460826176461214e+00
> 3.1550405800570377e-02
> 53 14 5.3394938807608198e-02 -3.8189091837479271e-03 2.7618414550374171e+00
> 3.4078755072804334e-02
>
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------
> however, in hp.solution.dt0.16700.n90.t236.p6 (wrong one)
> i      j
>
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------
> 50 14 3.1239406700376452e-02 8.5179559039992043e-03 2.9840003096148520e+00
> 2.1760859158622522e-02
> 51 14 3.8032143218986063e-02 3.6341965920997721e-03 2.9198035731818854e+00
> 2.6200771510346648e-02
> 53 14 5.0661309132451274e-02 -2.9274557377189617e-03 2.7606822480069755e+00
> 3.4021016413777964e-02
> 54 14 5.6049570141121191e-02 -2.8111244430837979e-03 2.6669503598276267e+00
> 3.8855104759650566e-02
>
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------
> the (i,j) = (52,14) is missing and as a result, one grid point solution is
> missing.
>
> I did not understand how this happens and why this happens?
> Any ideas?
>
> Thanks very much!
>
> Cheers,
>
> Rebecca
>
>
> --
> (Rebecca) Xuefei YUAN
> Department of Applied Physics and Applied Mathematics
> Columbia University
> Tel:917-399-8032
> www.columbia.edu/~xy2102 <http://www.columbia.edu/%7Exy2102>
>
>


-- 
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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