[petsc-users] The method of print the preconditioned matrix

[Matthew Knepley]

On Wed, May 19, 2021 at 8:36 AM 杨念 <yangnian at hnu.edu.cn> wrote:

> Dear Sir or Madam:
>
>
>
> Hello, I am a new PETSc learner. I'm having some problem with it and I'm
> using version 3.6.3 of PETSc. I can only print out the Jacobi matrix (J)
> with -mat_view from the command line, but I also need to print out the
> preconditioning operator (M^(-1)) or the preconditioned matrix (JM^(-1)).
> Is there a function like that in PETSC? Could you please give me some
> suggestions? Thank you so much.
>

I think you want


https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCComputeOperator.html

  Thanks,

     Matt


>
>
> Best regards,
>
>
>
> Nian Yang
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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