[petsc-users] Naturally ordered to DA vector copy

[khalid ashraf]

Hello, 
In my application, I need to do both Finite element(FEM) and Finite 
Difference(FD) computations.
I am doing the FD using the DA and FEM using natural numbering(x changes 
fastest, then y then z).
My question is what would be the fastest way to copy the FEM vectors to the FD 
vectors. Looks like 
DAGetAO may provide a mapping between DA vector layout and natural layout. Since 
I am not very familiar with programming using AO, just wanted to ask if there is 
a more efficient/easier way to copy from the naturally ordered vector to the DA 
vector before delving into AO. If I have to use AO, could you please redirect me 
to some related example.

Thanks in advance.

Khalid
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