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I use MatNorm and VecNorm on A and b before I call kspsolve, and both
of them are finite. Then I use fp_trap to catch where the nan comes
from. However, it traces down to unlikely place pthread_join. The gdb
where information is given below. Can you give me some help? Thanks.
0x7faeb6d8cbe5 i
: Warning not preallocating matrix storage
>
> What this means? Did I correctly preallocate the matrix?
>
> 2- I need to test MatSeqBAIJSetPreallocation() too but I little confused
> with descriptions of the command in man-page:
>
> what are "nz" and "nnz[]" i
> >>
> >> Xiangdong
> >
> > --
> > 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
>
--
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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On 12/14/2011 03:32 PM, Barry Smith wrote:
> On Dec 14, 2011, at 8:00 AM, robert wrote:
>
>> Hello,
>>
>> I am quite new to petsc and therefore my question might be quite trivial.
>>
>> I have a 1D finite difference code and want to store several vectors in a
>> binary:
>>
>> ierr = PetscView
n the liner system
first (once only) and then GMRES(m) is being used for stopping
criterion?
Kind regards,
Younas
RUG, Groningen, The Netherlands.
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n the liner system first
(once only) and then GMRES(m) is being used for stopping criterion?
Kind regards,
Younas
RUG, Groningen, The Netherlands.
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at are "nz" and "nnz[]" in this case?
what about number of blocks per row?
Thanks bothering too much :-)
BehZad
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gt; I am facing with two questions about Block-Sparse Preallocation:
>>
>> 1- I set array "nnz[]" and did:
>>
>> MatSetType ( JAC, MATSEQBAIJ );
>> MatSetSizes( JAC, PETSC_DECIDE, PETSC_DECIDE, nt, nt );
>> MatSeqAIJSetPreallocation( JAC, 0
On Dec 14, 2011, at 8:00 AM, robert wrote:
> Hello,
>
> I am quite new to petsc and therefore my question might be quite trivial.
>
> I have a 1D finite difference code and want to store several vectors in a
> binary:
>
> ierr = PetscViewerCreate(PETSC_COMM_WORLD,&viewer);CHKERRQ(ierr);
On Dec 14, 2011, at 7:07 AM, M.Younas wrote:
> Hi, PETSc, Team,
>
> I have solved a non-symmetric Poisson problem using GMRES(m) as solver and
> BoomerAMG (from Hypre) as preconditioner. But I don't understand how the
> BoomerAMG works as preconditioner with GMRES(m). Can anyone explain the
On Dec 14, 2011, at 2:02 AM, behzad baghapour wrote:
> Dear Developers,
>
> I am facing with two questions about Block-Sparse Preallocation:
>
> 1- I set array "nnz[]" and did:
>
> MatSetType ( JAC, MATSEQBAIJ );
> MatSetSizes( JAC, PETSC_DECIDE, PETSC_DECIDE, nt, nt );
> MatSe
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