unless the solution can be represented
> exactly by your FE space (eg, u(x,y) = x + y).
>
> On Mon, Oct 8, 2018 at 9:33 PM Matthew Knepley wrote:
>
>> On Mon, Oct 8, 2018 at 9:28 PM Weizhuo Wang
>> wrote:
>>
>>> The code is attached in case anyone wants to t
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!
>>
>> A
Amazing, right preconditioning fixes the problem. Thanks a lot!
On Tue, Oct 16, 2018 at 8:31 PM Dave May wrote:
>
>
> 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
The code is attached in case anyone wants to take a look, I will try the
high frequency scenario later.
On Mon, Oct 8, 2018 at 7:58 PM Mark Adams wrote:
>
>
> On Mon, Oct 8, 2018 at 6:58 PM Weizhuo Wang wrote:
>
>> The first plot is the norm with the flag -pc_type lu with re
the name of the example code from ex12.c to ex12c.c
Thanks for all your reply!
Weizhuo
Smith, Barry F.
>Please send your version of the example that computes the mean norm of
> the grid; I suspect we are talking apples and oranges
>
>Barry
>
>
>
> > On Oct 1, 201
I didn't specify a tolerance, it was using the default tolerance. Doesn't
the asymptoting norm implies finer grid won't help to get finer solution?
Mark Adams 于2018年10月2日周二 下午4:11写道：
>
>
> On Tue, Oct 2, 2018 at 5:04 PM Weizhuo Wang wrote:
>
>> Yes I was using one norm in
= PetscPrintf(PETSC_COMM_WORLD,"Norm of error %g iterations
%D\n",(double)norm/(m*n),its); CHKERRQ(ierr);
I made a plot to show the increase:
[image: Norm comparison.png]
Mark Adams 于2018年10月2日周二 下午2:27写道：
>
>
> On Tue, Oct 2, 2018 at 2:24 PM Weizhuo Wang wrote:
&g
I also tried to divide the norm by m*n , which is the number of grids, the
trend of norm still increases.
Thanks!
Weizhuo
Matthew Knepley 于2018年10月1日周一 下午7:45写道：
> On Mon, Oct 1, 2018 at 6:31 PM Weizhuo Wang wrote:
>
>> Hi!
>>
>> I'm recently trying out the example co
Hi!
I'm recently trying out the example code provided with the KSP solver
(ex12.c). I noticed that the mean norm of the grid increases as I use finer
meshes. For example, the mean norm is 5.72e-8 at m=10 n=10. However at
m=100, n=100, mean norm increases to 9.55e-6. This seems counter intuitive,
