Not exactly.
But you can make a Mat for each.
Mark
On Mon, Nov 14, 2022 at 8:59 AM Thomas Hisch wrote:
> Hi!
>
> I would like to ask if it is possible to create a MatNest matrix that
> contains matrices, vectors and scalars.
>
> My (jacobian) matrix looks like the following
>
> [[A, B, a, b],
>
On Mon, Nov 14, 2022 at 8:59 AM Thomas Hisch wrote:
> Hi!
>
> I would like to ask if it is possible to create a MatNest matrix that
> contains matrices, vectors and scalars.
>
No, You would turn everything into a type of matrix, but you can get the
effect you want.
Vectors can be easily used to
Hi!
I would like to ask if it is possible to create a MatNest matrix that
contains matrices, vectors and scalars.
My (jacobian) matrix looks like the following
[[A, B, a, b],
[C, D, c, d],
[e, f, g, h]]
where A-D are sparse square matrices, a-d are dense column vectors, e,
f are sparse row
On Mon, Nov 14, 2022 at 3:06 PM Matthew Knepley wrote:
>
> On Mon, Nov 14, 2022 at 8:59 AM Thomas Hisch wrote:
>>
>> Hi!
>>
>> I would like to ask if it is possible to create a MatNest matrix that
>> contains matrices, vectors and scalars.
>
>
> No, You would turn everything into a type of
This is an issue I've brought up before (and discussed in-person with Richard).
I wanted to bring it up again because I'm hitting the limits of what I know to
do, and I need help figuring this out.
The problem can be reproduced using Xolotl's "develop" branch built against a
petsc build with
In Xolotl's "feature-petsc-kokkos" branch, I have moved our code to use the COO
interface for preallocating and setting values in the Jacobian matrix. I have
found that with some of our test cases, using more than one MPI rank results in
a crash. Way down in the preconditioner code in petsc a
Very sorry for wasting so much of your time. The PCFIELDSPLIT generally will
not work with BAIJ matrices because the MatCreateSubMatrix() for BAIJ requires
indexing by block in the matrix. Your code should work if you use MPIAIJ
matrices. Note you can still use MatSetValuesBlocked() with
On Mon, Nov 14, 2022 at 4:19 PM Blaise Bourdin wrote:
> Replying to myself so that it gets into the googles:
>
> The reference tetrahedron used by DMPlexComputeCellGeometryAffineFEM has
> vertices at (-1,1,-1), (-1,-1,-1), (1, -1, -1) and (-1,-1,1).
>
It is
(-1, -1, -1) -- (-1, 1, -1) -- (1,
Can you clarify what you mean? For some classes of problems, PCFIELDSPLIT can
be a very efficacious preconditioner; for example when certain fields have very
different mathematical structure than others. In those cases it is worth using
AIJ and PCFIELDSPLIT instead of keeping BAIJ.
> On
Thanks Barry, Your help is always much appreciated! I'll try this out asap.
I have ended using baij because I have read the section "solving block
matrices" and I was thinking that baij was the only way to use fieldsplit!
Completely misunderstood then!
Il Lun 14 Nov 2022, 20:34 Barry Smith ha
Replying to myself so that it gets into the googles:
The reference tetrahedron used by DMPlexComputeCellGeometryAffineFEM has vertices at (-1,1,-1), (-1,-1,-1), (1, -1, -1) and (-1,-1,1).
Blaise
On Nov 10, 2022, at 6:42 PM, Matthew Knepley wrote:
On Thu, Nov 10,
On Mon, Nov 14, 2022 at 8:05 PM Mohammad Ali Yaqteen
wrote:
> I am sorry for the trouble but I don’t understand its usage. Like I want
> to read Vec xr. I am giving it to a pointer array. How would I access the
> values of the vector? Could you please briefly explain?
>
Suppose you have a vector
Mat of type (null)
Either the entire matrix (header) data structure has gotten corrupted or the
matrix type was never set. Can you run with valgrind to see if there is any
memory corruption?
> On Nov 14, 2022, at 1:24 PM, Fackler, Philip via petsc-users
> wrote:
>
> In Xolotl's
Hi, Philip,
Can you tell me instructions to build Xolotl to reproduce the error?
--Junchao Zhang
On Mon, Nov 14, 2022 at 12:24 PM Fackler, Philip via petsc-users <
petsc-users@mcs.anl.gov> wrote:
> In Xolotl's "feature-petsc-kokkos" branch, I have moved our code to use
> the COO interface for
I am using the following procedure to read from Vec, but it keeps giving me the
same values! I was told that using VecGetValues gives wrog output. If not this,
then what function should be used to read the contents of a vector?
for (int i = 0; i < nconv; i++)
{
On Mon, Nov 14, 2022 at 7:50 PM Mohammad Ali Yaqteen
wrote:
> I am using Eigen library to which I have to write these vector values from
> PETSc Vec. tdof is the length of the vector that I need and ei is the
> number of value in as an index:
>
> PetscIntei[tdof];
> PetscScalar eveci[tdof];
Hi, Philip,
Sorry to hear that. It seems you could run the same code on CPUs but not
no GPUs (with either petsc/Kokkos backend or petsc/cuda backend, is it
right?
--Junchao Zhang
On Mon, Nov 14, 2022 at 12:13 PM Fackler, Philip via petsc-users <
petsc-users@mcs.anl.gov> wrote:
> This is an
On Mon, Nov 14, 2022 at 7:39 PM Mohammad Ali Yaqteen
wrote:
> I am using the following procedure to read from Vec, but it keeps giving
> me the same values! I was told that using VecGetValues gives wrog output.
>
By who? It does not give the wrong output.
You do not show where in the code you
I am sorry for the trouble but I don’t understand its usage. Like I want to
read Vec xr. I am giving it to a pointer array. How would I access the values
of the vector? Could you please briefly explain?
From: Matthew Knepley
Sent: Tuesday, November 15, 2022 9:54 AM
To: Mohammad Ali Yaqteen
I am using Eigen library to which I have to write these vector values from
PETSc Vec. tdof is the length of the vector that I need and ei is the number of
value in as an index:
PetscIntei[tdof];
PetscScalar eveci[tdof];
for (int i = 0; i < tdof; i++)
ei[i] = i;
if (nconv>0)
{
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