int VecScatterBegin(Vec x,Vec y,InsertMode addv,ScatterMode mode,VecScatter inctx)Collective on VecScatter and Vec
x | - the vector from which we scatter |
y | - the vector to which we scatter |
addv | - either ADD_VALUES or INSERT_VALUES |
mode | - the scattering mode, usually SCATTER_FORWARD. The available modes are: |
inctx | - scatter context generated by VecScatterCreate() |
If you use SCATTER_REVERSE the first two arguments should be reversed, fromthe SCATTER_FORWARD. y[iy[i]] = x[ix[i]], for i=0,...,ni- 1
This scatter is far more general than the conventionalscatter, since it can be a gather or a scatter or a combination, depending on the indices ix and iy. If x is a parallel vector and yis sequential, VecScatterBegin() can serve to gather values to asingle processor. Similarly, if y is parallel and x sequential, theroutine can scatter from one processor to many processors.
Location: src/vec/utils/vscat.c
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