[petsc-users] Problem about the MatGetOrdering in Petsc

[Matthew Knepley]

On Fri, Apr 22, 2016 at 12:56 AM, Wei Deng <deng106 at purdue.edu> wrote:

> Dear Prof. Knepley,
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> I am a student from Prof. Sameh’s class, I am now trying to use RCM
> (Reverse Cuthill Mckee) to transform a sparse matrix into a banded one.
>
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> In a test case which can be perfectly transformed into band in matlab, I
> can’t achieve it in Petsc using the same data. The code can work, but I
> don’t know why does this problem appear. Could you spend some to give me
> some advice about this?
>

This is indeed RCM. I have cleaned up the code and taken snapshots of the
matrices. I am not sure what you are using in Matlab, but here
we are just calling SPARSEPAK:


https://bitbucket.org/petsc/petsc/src/78026435dbba2cd6fc5f6af7e1f769fa9012b35f/src/mat/order/genrcm.c?at=master&fileviewer=file-view-default

  Thanks,

     Matt


> Really appreciate about that.
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> Thanks a lot.
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> Wei Deng
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