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[Johan Hake <question129296@xxxxxxxxxxxxxxxxxxxxx>]

Question #129296 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/129296

Johan Hake proposed the following answer:
On Thursday October 14 2010 15:34:09 Jack wrote:
> Question #129296 on DOLFIN changed:
> https://answers.launchpad.net/dolfin/+question/129296
> 
> Jack requested for more information:
> Thanks again, Johan, works brilliantly.
> 
> If I may just impose on you again.
> 
> The only part of my code that now breaks down with MPI is where I have
> to allocate to each member of a std::vector, the corresponding values
> from a Function u, i.e.,
> 
> int j = 0;
> for (std::vector<foo*>::iterator p = instances.begin(); p !=
> instances.end(); ++p) { (*p)->set_value( u.vector()[j] );
> 	++j;
> }

If instances is a std::vector of size v.local_size() then you should be able 
to do something like:

   Array<double> values(v.size());
   v.get_local(values);

   for (std::vector<foo*>::iterator p = instances.begin(); p !=
   instances.end(); ++p) { (*p)->set_value( values[j] );
 	++j;
   }

Johan
> Is there a way to reduce this to the local size of the u vector and
> associate the correct local range?
> 
> Many thanks
> 
> Jack

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