Hi,
My problem has an irregular domain and for the nodes I have to apply
boundary condition, I only know their node number in nature ordering.
How do I apply BC(zero out the corresponding entries in global Vec and Mat)
after DMPlexDistribute when it is all in global ordering?
If using DMLabel,
Use -ksp_view to confirm the options are actually set.
Fande
Sent from my iPhone
> On Oct 16, 2018, at 7:40 PM, Ellen M. Price
> wrote:
>
> Maybe a stupid suggestion, but sometimes I forget to call the
> *SetFromOptions function on my object, and then get confused when
> changing the
Maybe a stupid suggestion, but sometimes I forget to call the
*SetFromOptions function on my object, and then get confused when
changing the options has no effect. Just a thought from a fellow grad
student.
Ellen
On 10/16/2018 09:36 PM, Matthew Knepley wrote:
> On Tue, Oct 16, 2018 at 9:14 PM
On Tue, Oct 16, 2018 at 9:14 PM Weizhuo Wang wrote:
> I just tried both, neither of them make a difference. I got exactly the
> same curve with either combination.
>
I have a hard time believing you. If you make the residual tolerance much
finer, your error will definitely change.
I run tests
On Wed, 17 Oct 2018 at 03:15, Weizhuo Wang wrote:
> I just tried both, neither of them make a difference. I got exactly the
> same curve with either combination.
>
Try using right preconditioning.
https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/KSP/KSPSetPCSide.html
Use the
I just tried both, neither of them make a difference. I got exactly the
same curve with either combination.
Thanks!
Wang weizhuo
On Tue, Oct 16, 2018 at 8:06 PM Matthew Knepley wrote:
> On Tue, Oct 16, 2018 at 7:26 PM Weizhuo Wang
> wrote:
>
>> Hello again!
>>
>> After some tweaking the code
On Tue, Oct 16, 2018 at 7:26 PM Weizhuo Wang wrote:
> Hello again!
>
> After some tweaking the code is giving right answers now. However it start
> to disagree with MATLAB results ('traditional' way using matrix inverse)
> when the grid is larger than 100*100. My PhD advisor and I suspects that
Hello again!
After some tweaking the code is giving right answers now. However it start
to disagree with MATLAB results ('traditional' way using matrix inverse)
when the grid is larger than 100*100. My PhD advisor and I suspects that
the default dimension of the Krylov subspace is 100 in the test
On Tue, Oct 16, 2018 at 12:31 PM Josh L wrote:
> Hi,
>
> Does anyone use PETSc to calculate the value determinant, basis function
> and the derivative of basis function at Gauss integration point?
>
> For quadrilateral element, I use PetscDTGaussQuadrature to get the
> location of integration
Hi,
Does anyone use PETSc to calculate the value determinant, basis function
and the derivative of basis function at Gauss integration point?
For quadrilateral element, I use PetscDTGaussQuadrature to get the location
of integration point, and then use DMPlexComputeCellGeometryFEM to get the
On Tue, Oct 16, 2018 at 3:57 AM Anton Popov wrote:
> Hi Manuel,
>
> you might consider useful taking a look at this code
> https://bitbucket.org/bkaus/lamem, which is a multi-DMDA staggered grid
> implementation.
>
> Also, as Matt pointed out, there is a direct PETSc support for staggered
>
Hi Manuel,
you might consider useful taking a look at this code
https://bitbucket.org/bkaus/lamem, which is a multi-DMDA staggered grid
implementation.
Also, as Matt pointed out, there is a direct PETSc support for staggered
grids (DMSTAG), recently contributed by Patrick Sanan.
Thanks,
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