Hello Nan,
1). I am trying to do the solution interpolation from the vertex to
the cell. For a 2-D problem, it is interpolating 4 values on vertices
to 1 value for the cell. However, I only find
DoFTools::distribute_cell_to_dof_vector, which project cell value to
vertex values. Is there any function I can use for global
interpolation from vertex to cell? Which step gives an example for this?
VectorTools::integrate_difference does something in this direction, if
you choose ZeroFunction as exact_solution.
2). I am using cell->measure() to get the cell volume for a 3-D
problem. If I also want the six face areas for this cell, what can I
do? Is there any example?
One possibility would be to loop over all faces of the cell and call
cell->face(face)->measure (). Then you can sum up these 6 values and get
the volume of the boundary.
Best Regards,
Markus
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