: 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
?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
procedure? Does it work like BoomerAMG precondition the l
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 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
