Geoffrey Irving <[email protected]> writes: > For anything other than MPI_SUM, the evaluation points would likely > want to be different, so the structure of the code would be > significantly changed. For example, MPI_MAX probably wants evaluation > points at the vertices, which can't be optimally coded using the same > code structure used for MPI_SUM (since different elements share > vertices).
That's fair, though extrema can also occur internally to an element. > The main difference is that the quadrature rule has to be specified > independent of the PetscFE objects, since the PetscFE elements for the > different fields might have incompatible quadrature rules. How is that different from evaluating coupling terms between fields in different spaces?
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