Hi Wolfgang,

>> For me it runs okay until
>> output_results(): we are setting values in the ghosted vector
>> joint_solution there, which we are no longer allowed to do
>> (ExcGhostsPresent). I am too tired to fix this now, though. :-)
>
> Aw, indeed. I admit not even having an idea how to work around that. What do
> you think?

One option is to write into a temporary vector without ghost elements
and skipping values that are not locally_owned. Before writing out the
solution, one assigns the temporary vector into (the ghosted)
joint_solution. I have no time to do work on that over the next days,
though.

--
Timo Heister
http://num.math.uni-goettingen.de/~heister
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