Ah ok, Then I will have a look at matconvert. And then maybe later switch to AIJ as well. Thanks of the help, Frank On 29 May 2024, at 16: 57, Barry Smith <bsmith@ petsc. dev> wrote: You can use MatConvert()On May 29, 2024, at 10: 53 AM,
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Ah ok,

Then I will have a look at matconvert. 
And then maybe later switch to AIJ as well.


Thanks of the help, Frank


On 29 May 2024, at 16:57, Barry Smith <bsmith@petsc.dev> wrote:


  You can use MatConvert()


On May 29, 2024, at 10:53 AM, Frank Bramkamp <bramkamp@nsc.liu.se> wrote:

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Hello Hong,

Thank you for the clarification.
If I already have a BAIJ matrix format, can I then convert it later into AIJ format as well ?!
In that case I would have two matrices, but that would be ok for testing.
I think that you sometimes convert different matrix formats into each other ?!


Since I typically have BAIJ format, I also use a blocked ILU, which would turn into a point wise ILU
for an AIJ matrix. That is why I typically have the BAIJ format.

Otherwise, I have to change it into an AIJ format from the beginning.


Thanks for the quick help,

Frank