how to inverse a sparse matrix in Petsc?

[Barry Smith]

    Yes. It uses the LU factorization of the matrix computed with  
MatLUFactor().

    Barry

On Feb 4, 2008, at 7:49 AM, li pan wrote:

> hi,
> Does MatMatSolve() use Gauss elimination method?
>
> thanx
>
> pan
>
>
> --- Barry Smith <bsmith at mcs.anl.gov> wrote:
>
>>
>>    For sequential AIJ matrices you can fill the B
>> matrix with the
>> identity and then use
>> MatMatSolve().
>>
>>    Note since the inverse of a sparse matrix is
>> dense the B matrix is
>> a SeqDense matrix.
>>
>>    Barry
>>
>> On Feb 4, 2008, at 12:37 AM, Yujie wrote:
>>
>>> Hi,
>>> Now, I want to inverse a sparse matrix. I have
>> browsed the manual,
>>> however, I can't find some information. could you
>> give me some advice?
>>>
>>> thanks a lot.
>>>
>>> Regards,
>>> Yujie
>>>
>>
>>
>
>
>
>       
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