Remaps the "from" and "to" indices in a vector scatter context. FOR EXPERTS ONLY!
PetscErrorCode VecScatterRemap(VecScatter scat,PetscInt tomap,PetscInt frommap)
Collective on VecScatter
|scat ||- vector scatter context
|tomap ||- remapping plan for "to" indices (may be NULL).
|frommap ||- remapping plan for "from" indices (may be NULL)
In the parallel case the todata contains indices from where the data is taken
(and then sent to others)! The fromdata contains indices from where the received
data is finally put locally.
In the sequential case the todata contains indices from where the data is put
and the fromdata contains indices from where the data is taken from.
This is backwards from the paralllel case!
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