Re: [deal.II] HOW TO OUTPUT SYSTEM MATRIX IN A FILE

[孙翔]

Thank you very much. 

On Wednesday, 29 July 2020 12:31:30 UTC-7, Daniel Arndt wrote:
>
> Of course, there is also PETScWrappers::MatrixBase::print(
> https://www.dealii.org/current/doxygen/deal.II/classPETScWrappers_1_1MatrixBase.html#a7515e640202d1ad50bd9baa13c404cb1)
>  
> that should work.
>
> Best,
> Daniel
>
> Am Mi., 29. Juli 2020 um 12:59 Uhr schrieb Wolfgang Bangerth <
> bang...@colostate.edu >:
>
>> On 7/28/20 12:11 PM, 孙翔 wrote:
>> > Hi, I followed step-17 and build a system matrix of which type 
>> > is PETScWrappers::MPI::SparseMatrix. I want to output it after 
>> assembling. How 
>> > should I do it? Thank you very much.
>>
>> If performance doesn't matter, just loop over all indices i and j and 
>> output 
>> the value of the matrix. If you're running in parallel, you need to 
>> restrict 
>> the loop over i to the locally owned range.
>>
>> Best
>>   W.
>>
>>
>> -- 
>> 
>> Wolfgang Bangerth  email: bang...@colostate.edu 
>> 
>> www: http://www.math.colostate.edu/~bangerth/
>>
>> -- 
>> The deal.II project is located at http://www.dealii.org/
>> For mailing list/forum options, see 
>> https://groups.google.com/d/forum/dealii?hl=en
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>> .
>>
>

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Re: [deal.II] HOW TO OUTPUT SYSTEM MATRIX IN A FILE

[孙翔]

Thank you very much. 

On Wednesday, 29 July 2020 09:59:43 UTC-7, Wolfgang Bangerth wrote:
>
> On 7/28/20 12:11 PM, 孙翔 wrote: 
> > Hi, I followed step-17 and build a system matrix of which type 
> > is PETScWrappers::MPI::SparseMatrix. I want to output it after 
> assembling. How 
> > should I do it? Thank you very much. 
>
> If performance doesn't matter, just loop over all indices i and j and 
> output 
> the value of the matrix. If you're running in parallel, you need to 
> restrict 
> the loop over i to the locally owned range. 
>
> Best 
>   W. 
>
>
> -- 
>  
> Wolfgang Bangerth  email: bang...@colostate.edu 
>  
> www: http://www.math.colostate.edu/~bangerth/ 
>
>

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Re: [deal.II] HOW TO OUTPUT SYSTEM MATRIX IN A FILE

[Wolfgang Bangerth]

On 7/29/20 1:31 PM, Daniel Arndt wrote:
Of course, there is also 
PETScWrappers::MatrixBase::print(https://www.dealii.org/current/doxygen/deal.II/classPETScWrappers_1_1MatrixBase.html#a7515e640202d1ad50bd9baa13c404cb1 
) 
that should work.


Ah, yes, that's much better!
W.

--

Wolfgang Bangerth  email: bange...@colostate.edu
   www: http://www.math.colostate.edu/~bangerth/

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Re: [deal.II] HOW TO OUTPUT SYSTEM MATRIX IN A FILE

[Daniel Arndt]

Of course, there is also PETScWrappers::MatrixBase::print(
https://www.dealii.org/current/doxygen/deal.II/classPETScWrappers_1_1MatrixBase.html#a7515e640202d1ad50bd9baa13c404cb1)
that should work.

Best,
Daniel

Am Mi., 29. Juli 2020 um 12:59 Uhr schrieb Wolfgang Bangerth <
bange...@colostate.edu>:

> On 7/28/20 12:11 PM, 孙翔 wrote:
> > Hi, I followed step-17 and build a system matrix of which type
> > is PETScWrappers::MPI::SparseMatrix. I want to output it after
> assembling. How
> > should I do it? Thank you very much.
>
> If performance doesn't matter, just loop over all indices i and j and
> output
> the value of the matrix. If you're running in parallel, you need to
> restrict
> the loop over i to the locally owned range.
>
> Best
>   W.
>
>
> --
> 
> Wolfgang Bangerth  email: bange...@colostate.edu
> www: http://www.math.colostate.edu/~bangerth/
>
> --
> The deal.II project is located at http://www.dealii.org/
> For mailing list/forum options, see
> https://groups.google.com/d/forum/dealii?hl=en
> ---
> You received this message because you are subscribed to the Google Groups
> "deal.II User Group" group.
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> To view this discussion on the web visit
> https://groups.google.com/d/msgid/dealii/879a7ef3-7c13-8142-d970-773e3a57e470%40colostate.edu
> .
>

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Re: [deal.II] HOW TO OUTPUT SYSTEM MATRIX IN A FILE

[Wolfgang Bangerth]

On 7/28/20 12:11 PM, 孙翔 wrote:
Hi, I followed step-17 and build a system matrix of which type 
is PETScWrappers::MPI::SparseMatrix. I want to output it after assembling. How 
should I do it? Thank you very much.


If performance doesn't matter, just loop over all indices i and j and output 
the value of the matrix. If you're running in parallel, you need to restrict 
the loop over i to the locally owned range.


Best
 W.


--

Wolfgang Bangerth  email: bange...@colostate.edu
   www: http://www.math.colostate.edu/~bangerth/

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[deal.II] HOW TO OUTPUT SYSTEM MATRIX IN A FILE

[孙翔]

Hi, I followed step-17 and build a system matrix of which type 
is PETScWrappers::MPI::SparseMatrix. I want to output it after assembling. 
How should I do it? Thank you very much. 

Best,

Xiang

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