[petsc-users] Concatenating DM vectors

[Randall Mackie]

Hi Alfredo

Take a look at VecStrideGather and VecStrideScatter….maybe these are what you want?

https://petsc.org/release/docs/manualpages/Vec/VecStrideGather.html <https://petsc.org/release/docs/manualpages/Vec/VecStrideGather.html>

https://petsc.org/release/docs/manualpages/Vec/VecStrideScatter.html <https://petsc.org/release/docs/manualpages/Vec/VecStrideScatter.html>


Randy M.


> On Aug 11, 2021, at 12:33 PM, Alfredo J Duarte Gomez <aduarteg at utexas.edu> wrote:
> 
> Good morning,
> 
> I am currently handling a structured dmda object with more than one field.
> 
> In some intermediate operations, I have to create and handle vectors of a size that corresponds to the same dmda with one field only.
> 
> After that, it would be very useful to concatenate these vectors and then use them with matrices of the size of the original dmda (more than one field), I hope the vectors keep their i,j structure from the dmda.
> 
> I tried using VecConcatenate but it seems to be scrambling the vector without the i,j arrangement, and the only other way I can think of is using a for loop over every grid point which seems cumbersome.
> 
> Any suggestions for this problem?
> 
> -Alfredo
> 
> -- 
> Alfredo Duarte
> Graduate Research Assistant
> The University of Texas at Austin

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