[petsc-users] copy vector between communicators

[Jed Brown]

Alexander Grayver <agrayver at gfz-potsdam.de> writes:

> Hello,
>
> I need to have a copy of a vector created on the communicator COMM to 
> another vector created on the communicator SUBCOMM (which is a subset of 
> the COMM processes).
> Are there any standard functions that can help here? I assume VecScatter 
> could help, but I am not sure how to use it here?

Where is the information to specify from where you need to get the data?
You can always create a dummy sequential vector and VecPlaceArray the
SUBCOMM-Vec's array as the destination of the scatter.  Any processes
not part of SUBCOMM should have an empty destination Vec.
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