Dear all
It depends on the problem. It can have hundreds of thousands of degrees of
freedom.
best,
Seung Lee Kwon
2023년 4월 25일 (화) 오후 12:32, Barry Smith 님이 작성:
>
> How large are the dense matrices you would like to invert?
>
> On Apr 24, 2023, at 11:27 PM, 권승리 / 학생 / 항공우주공학과
> wrote:
>
>
How large are the dense matrices you would like to invert?
> On Apr 24, 2023, at 11:27 PM, 권승리 / 학생 / 항공우주공학과 wrote:
>
> Dear all
>
> Hello.
> I want to make an inverse matrix like inv(A) in MATLAB.
>
> Are there some methods to inverse matrix in petsc?
>
> If not, I want to use the
Dear all
Hello.
I want to make an inverse matrix like inv(A) in MATLAB.
Are there some methods to inverse matrix in petsc?
If not, I want to use the inverse function in the LAPACK library.
Then, how to use the LAPACK library in petsc? I use the C language.
Best,
Seung Lee Kwon
--
Seung Lee
On Mon, Apr 24, 2023 at 4:00 PM neil liu wrote:
> I try to find the source code, that transforms the scalar basis <1 x y> to
> a vectors basis
>
> / 1 \ / 0 \ / x \ / 0 \ / y \ / 0 \
> \ 0 / \ 1 / \ 0 / \ x / \ 0 / \ y /
>
> It seems it is processed by line 856
>
>
I try to find the source code, that transforms the scalar basis <1 x y> to
a vectors basis
/ 1 \ / 0 \ / x \ / 0 \ / y \ / 0 \
\ 0 / \ 1 / \ 0 / \ x / \ 0 / \ y /
It seems it is processed by line 856
https://gitlab.com/petsc/petsc/-/blob/main/include/petsc/private/petscimpl.h
Could you
On Mon, Apr 24, 2023 at 1:58 PM Karthikeyan Chockalingam - STFC UKRI <
karthikeyan.chockalin...@stfc.ac.uk> wrote:
> Changing the names to NULL produced the same error.
>
This is just to make the code simpler.
> Don’t I have to give the fields a name?
>
They get the default name, which is the
Changing the names to NULL produced the same error. Don’t I have to give the
fields a name?
The problem solution didn’t change from one time step to the next.
[1;31m[0]PETSC ERROR: - Error Message
--
On Mon, Apr 24, 2023 at 1:37 PM Karthikeyan Chockalingam - STFC UKRI <
karthikeyan.chockalin...@stfc.ac.uk> wrote:
> Great to know there is an example now.
>
>
>
> Yes, -pc_fieldsplit_defect_saddle_point worked.
>
>
>
> But I would like to understand what I did wrong (and why it didn’t work).
>
Great to know there is an example now.
Yes, -pc_fieldsplit_defect_saddle_point worked.
But I would like to understand what I did wrong (and why it didn’t work).
After reading many posted posts, I needed to create PCFieldSplitSetIS to split
the fields.
I set the first N indices to the field phi
On Mon, Apr 24, 2023 at 10:22 AM Karthikeyan Chockalingam - STFC UKRI <
karthikeyan.chockalin...@stfc.ac.uk> wrote:
> Hello,
>
>
>
> I was able to construct the below K matrix (using submatrices P and P^T),
> which is of type MATAIJ
>
> K = [A P^T
>
>P 0]
>
> and solved them using a
Hello,
I was able to construct the below K matrix (using submatrices P and P^T), which
is of type MATAIJ
K = [A P^T
P 0]
and solved them using a direct solver.
However, I was reading online that this is a saddle point problem and I should
be employing PCFIELDSPLIT.
Since I have one
On Mon, Apr 24, 2023 at 7:33 AM 吉兴洲 wrote:
> Dear all,
>
> I'm solving a fluid problem and it has multiple square cylinders in the
> flow area. Unfortunately, I have to use a Cartesian grid (nonuniform) which
> can't generated by Gmsh.
>
> I have noticed that the object *DMDA* and *DMFOREST*
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Dear all,
I'm solving a fluid problem and it has multiple square cylinders in the
flow area. Unfortunately, I have to use a Cartesian grid (nonuniform) which
can't generated by Gmsh.
I have noticed that the object *DMDA* and *DMFOREST* typically have there
own intrinsic methods such as
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