Thanks, Lawrence. I did see that book.
Is nleqerr generally better than bt or l2? I seem to see someone claims that.
Qi
On Jul 29, 2022, at 3:27 PM, Lawrence Mitchell wrote:
On Fri, 29 Jul 2022 at 18:36, Tang, Qi mailto:tan...@msu.edu>>
wrote:
Thanks, Matt. This one is very helpful
Ther
Barry,
So adding the call to MatSetBlockSize to the preallocator does fix the error,
but that is not necessary if I simply replace the call to
MatPreallocaterPreallocate with a call to MatMPIAIJSetPreallocation.
And it’s confusing to me especially in light of this exchange a couple months
ago
Because you create the DMDA with a dof of 3, this triggers any matrices it
creates and the localtoglobalmapping object it creates to have a block size of
three. The error you are seeing is that a localtoglobal with a block size of 3
cannot be attached to a matrix with a block size of 1.
T
Why do I have to set the block size to 3? I’m not trying to create a block
matrix.
In fact just a couple months ago I was told I don’t have block matrices and I
had to remove calls to set the block size:
https://lists.mcs.anl.gov/mailman/htdig/petsc-users/2022-May/046094.html
This works fine w
On Fri, 29 Jul 2022 at 18:36, Tang, Qi wrote:
> Thanks, Matt. This one is very helpful
>
There's also the Deuflhard book on the affine covariant linesearch
(snes_linesearch_type nleqerr)
Lawrence
>
I'm hoping that it is as simple as that you did not set the block size of
your newly created matrix to 3?
> On Jul 29, 2022, at 4:04 PM, Randall Mackie wrote:
>
> Hi Barry,
>
> It seems like this should be trivial to get working but so far I’ve been
> unsuccessful.
> Most likely I’m doin
Hi Barry,It seems like this should be trivial to get working but so far I’ve been unsuccessful.Most likely I’m doing something wrong but I have no idea what that is.I’ve attached a little test program that fails with the errors:[0]PETSC ERROR: - Error Message ---
Thanks, Matt. This one is very helpful
On Jul 29, 2022, at 9:24 AM, Matthew Knepley wrote:
On Thu, Jul 28, 2022 at 6:16 PM Tang, Qi
mailto:tan...@msu.edu>> wrote:
Hi,
Is there some in depth review on different options related to line search of
snes newtonls? Our solvers are sensitive to th
Thanks a lot.
On Fri, Jul 29, 2022 at 12:11 PM Barry Smith wrote:
>
> If you already have Matlab matrices that were saved with, for example,
>
> save example.mat A
>
> It may be possible to use MatLoad() directly on them using
> the PETSCVIEWERHDF5 viewer type (and not need to use the
> PetscB
If you already have Matlab matrices that were saved with, for example,
save example.mat A
It may be possible to use MatLoad() directly on them using the PETSCVIEWERHDF5
viewer type (and not need to use the PetscBinaryWrite()). Please read the full
manual page https://petsc.org/release/docs/m
You can use share/petsc/matlab/PetscBinaryWrite.m.
matlab> PetscBinaryWrite('matrix.petsc', sparse(A))
Then load it with MatLoad in PETSc.
Ahmed Mansur writes:
> How to import a sparse matrix from Matlab using C++ and PETSC , if anyone
> has any example code, thanks
How to import a sparse matrix from Matlab using C++ and PETSC , if anyone
has any example code, thanks
On Thu, Jul 28, 2022 at 6:16 PM Tang, Qi wrote:
> Hi,
>
> Is there some in depth review on different options related to line search
> of snes newtonls? Our solvers are sensitive to the choices there, and I
> could not understand why one works better than the other or how to tune
> those options.
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