[petsc-users] how to visualize the matordering?

[Matthew Knepley]

On Fri, Sep 13, 2024 at 2:40 AM Klaij, Christiaan <C.Klaij at marin.nl> wrote:

> Thanks Barry, that works fine. Any chance to access the reordered matrix
> behind the plot?
>

You can make it with MatPermute().

  Thanks,

     Matt


> Chris
>
> ________________________________________
> From: Barry Smith <bsmith at petsc.dev>
> Sent: Tuesday, September 10, 2024 3:09 PM
> To: Klaij, Christiaan
> Cc: petsc-users at mcs.anl.gov
> Subject: Re: [petsc-users] how to visualize the matordering?
>
> You don't often get email from bsmith at petsc.dev. Learn why this is
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>
>    You can save the plot in an image file that does not require X. For
> example
>
>     -mat_view_ordering draw:image:filename
>
>    Several image formats are available.
>
>
>    Barry
>
>
> On Sep 10, 2024, at 7:36 AM, Klaij, Christiaan <C.Klaij at marin.nl> wrote:
>
> I'm saving a petsc mat to file and loading it into python to make a spy
> plot of its sparsity pattern, so far so good.
>
> Now I would like to compare with a reordened pattern, say rcm. I've notice
> the option -mat_view_ordering draw, but do not have X Windows on this
> machine. What is the recommended way to get the reordened matrix for
> inspection?
>
> Chris
> <image859244.png>
> dr. ir.     Christiaan       Klaij
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