David :
I did following:
PC pc;
Mat F;
ierr = KSPGetPC(ksp,&pc);CHKERRQ(ierr);
ierr = PCReset(pc);CHKERRQ(ierr);
ierr = KSPSetOperators(ksp,A,A);CHKERRQ(ierr);
ierr = PCSetType(pc,PCCHOLESKY);CHKERRQ(ierr);
ierr = PCFactorSetMatSolverPackag
On Mon, Sep 19, 2016 at 9:45 PM, Fande Kong wrote:
> Placing PCReset(PC pc) before the second kspsolve might works.
>
> Fande Kong,
>
> On Mon, Sep 19, 2016 at 7:38 PM, murat keçeli wrote:
>
>> Another guess: maybe you also need KSPSetUp(ksp); before the second
>> KSPSolve(ksp,b,x);.
>>
>> Murat
Placing PCReset(PC pc) before the second kspsolve might works.
Fande Kong,
On Mon, Sep 19, 2016 at 7:38 PM, murat keçeli wrote:
> Another guess: maybe you also need KSPSetUp(ksp); before the second
> KSPSolve(ksp,b,x);.
>
> Murat Keceli
>
>
> On Mon, Sep 19, 2016 at 8:33 PM, David Knezevic <
Another guess: maybe you also need KSPSetUp(ksp); before the second
KSPSolve(ksp,b,x);.
Murat Keceli
On Mon, Sep 19, 2016 at 8:33 PM, David Knezevic
wrote:
> On Mon, Sep 19, 2016 at 7:26 PM, Dave May wrote:
>
>>
>>
>> On 19 September 2016 at 21:05, David Knezevic > > wrote:
>>
>>> When I use
On Mon, Sep 19, 2016 at 7:26 PM, Dave May wrote:
>
>
> On 19 September 2016 at 21:05, David Knezevic
> wrote:
>
>> When I use MUMPS via PETSc, one issue is that it can sometimes fail with
>> MUMPS error -9, which means that MUMPS didn't allocate a big enough
>> workspace. This can typically be f
On 19 September 2016 at 21:05, David Knezevic
wrote:
> When I use MUMPS via PETSc, one issue is that it can sometimes fail with
> MUMPS error -9, which means that MUMPS didn't allocate a big enough
> workspace. This can typically be fixed by increasing MUMPS icntl 14, e.g.
> via the command line
David :
I'll check it ...
Hong
When I use MUMPS via PETSc, one issue is that it can sometimes fail with
> MUMPS error -9, which means that MUMPS didn't allocate a big enough
> workspace. This can typically be fixed by increasing MUMPS icntl 14, e.g.
> via the command line option -mat_mumps_icntl_1
> On Sep 19, 2016, at 2:21 PM, Cyrill Vonplanta
> wrote:
>
>
>> block size > 1 really only makes sense if the block size is really greater
>> than one. So if A has blocks of size 3 you should create A as BAIJ and thus
>> never need to call the convert routine.
>
> Unfortunately A is not cr
> block size > 1 really only makes sense if the block size is really greater
> than one. So if A has blocks of size 3 you should create A as BAIJ and thus
> never need to call the convert routine.
Unfortunately A is not created by my part of the program and comes with
blocksize 1.
>
> You
Ok, got it!
Thanks
On Mon, Sep 19, 2016 at 6:25 AM, Matthew Knepley wrote:
> On Fri, Sep 16, 2016 at 11:36 AM, Adrian Maldonado
> wrote:
>
>> Hi,
>>
>> I am trying to understand some of the data structures DMPlex/DMNetwork
>> creates and the relationship among them.
>>
>> As an example, I have
When I use MUMPS via PETSc, one issue is that it can sometimes fail with
MUMPS error -9, which means that MUMPS didn't allocate a big enough
workspace. This can typically be fixed by increasing MUMPS icntl 14, e.g.
via the command line option -mat_mumps_icntl_14.
However, instead of having to run
> On Sep 19, 2016, at 10:43 AM, Cyrill Vonplanta
> wrote:
>
> Barry,
>
> Thanks a lot. I’d like to use this for a nonlinear variant of a
> block-gauss-seidel smoother. I would like to use MatInvertBlockDiagonal for
> speeding up my variant.
>
> I think I can work with this, however I also h
Barry,
Thanks a lot. I’d like to use this for a nonlinear variant of a
block-gauss-seidel smoother. I would like to use MatInvertBlockDiagonal for
speeding up my variant.
I think I can work with this, however I also have the problem to turn my
initial matrix into one with a blocksize of 3.When
Cyrill,
This is very specialized for implementing point block Jacobi; I don't think
it is something you would want to use directly.
If you do want to use it, it simply returns the inverses of the block
diagonals in column major form. You can then call MatSetValues() with with each
丁老师:
> Dear friends:
> I want to diagonalize matrix D:
> D=PAP^(-1).
> where A is the diagonal matrix , P is the transformation matrix.
> Does Petsc has this routine to perform this task.
>
This is an eigenvalu/singular value decomposition of D. For dense D, you
ca
On Mon, Sep 19, 2016 at 7:15 AM, 丁老师 wrote:
> Dear friends:
> I want to diagonalize matrix D:
> D=PAP^(-1).
> where A is the diagonal matrix , P is the transformation matrix.
> Does Petsc has this routine to perform this task.
>
No, you should check out
http://
Dear friends:
I want to diagonalize matrix D:
D=PAP^(-1).
where A is the diagonal matrix , P is the transformation matrix.
Does Petsc has this routine to perform this task.
Regards
On Fri, Sep 16, 2016 at 11:36 AM, Adrian Maldonado
wrote:
> Hi,
>
> I am trying to understand some of the data structures DMPlex/DMNetwork
> creates and the relationship among them.
>
> As an example, I have an small test circuit (/src/ksp/ksp/examples/
> tutorials/network/ex1.c).
>
> This is a g
On Fri, Sep 16, 2016 at 12:54 PM, Adrian Maldonado
wrote:
> Just one addition about one thing I've noticed.
>
> The section:
>
> PetscSection Object: 2 MPI processes
> type not yet set
> Process 0:
> ( 0) dim 1 offset 0
> ( 1) dim 1 offset 1
> ( 2) dim 1 offset 2
> ( 3)
Dear PETSc-Users,
I would like to use the inverted block diagonals of a a matrix. I have seen the
function MatInvertBlockDiagonal() but I don’t know how to create a matrix out
of them or an array of block matrizes.
Does anyone have an example on how to use **values to create a PETSc matrix?
T
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