[petsc-users] DMDA questions

[Jed Brown]

Xiangdong <epscodes at gmail.com> writes:

> If I first define a DM, and obtain the solution vector on this DM (through
> non multigrid method).  However, given that this DM is so fine, I may only
> need to save/view the solution on a coarsen grid. Is there some functions
> available in petsc for this instead of writing my own vec scatter?

Where did you try searching and what terms did you try before asking?

http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/DM/DMCoarsen.html
http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/DM/DMCreateInterpolation.html
http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/DM/DMCreateInjection.html
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