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<div>I want to add root values to leaves, and keep root unchanged. PetscSFBcast came to my mind, but unfortunately it only broadcasts roots and does not have an MPI_Op argument like PetscSFReduce for me to choose from INSERT_VALUES, ADD_VALUES, etc.</div>
<div>Any tips? Thanks.</div>
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<div>PS: I met this problem when I tried to implement VecScatter in SF. In VecScatter, multiple entries of vec x can be scattered to the same entry of vec y, and one entry of x can also be scattered to multiple entries of y. I want to use one SF for all combinations
of SCATTER_FORWARD/BACKWARD, INSERT/ADD_VALUES. It seems impossible with current SF interface.</div>
<div>--Junchao Zhang<br>
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