On 5/26/21 10:20 PM, vachanpo...@gmail.com wrote:
I have a quantity which has a single value in a cell. Let me call this an
"average". I want to be able to access the average of neighbouring cells from
every cell.
What data structure can I use?
Since don't have mesh refinement, I was thinking of mapping this average to
the cell index and using a parallel vector for storage. However,
LA::MPI::Vector probably will not work because cell numbering is not
continuous within a subdomain. Also, I couldn't find any function that can
reorder the cells which may enable use of LA::MPI::Vector.
In the worst case, I can make a regular LA::MPI::Vector (using dofs) and set
the average to all dofs in a cell. I hope there is an alternative.
You are looking for cell->global_active_cell_index(), which is documented like
so:
/**
* Return a globally unique cell index for the current cell,
* assuming it is not artificial. The value is identical to
* active_cell_index() if the cell is part of a serial
* triangulation.
*
* In the context of parallel triangulations, locally-owned cells
* are enumerated contiguously within each subdomain of the
* mesh. This ensures that the index returned by this function can
* be used as the index into vectors with a total of
* Triangulation::n_globally_active_cells() entries, and for which
* every process stores a contiguous part. If such a cell-data
* vector has been set up with
* parallel::TriangulationBase::global_active_cell_index_partitioner(),
* the index returned by this function can then be used to access
* the correct vector entry.
*/
types::global_cell_index
global_active_cell_index() const;
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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