Copies between a reduced vector and the appropriate elements of a full-space vector.
PetscErrorCode VecISCopy(Vec vfull, IS is, ScatterMode mode, Vec vreduced)
|vfull ||- the full-space vector
|is ||- the index set for the reduced space
|mode ||- the direction of copying, SCATTER_FORWARD or SCATTER_REVERSE
|vreduced ||- the reduced-space vector
|vfull ||- the sum of the full-space vector and reduced-space vector
The index set identifies entries in the global vector.
Negative indices are skipped; indices outside the ownership range of vfull will raise an error.
mode == SCATTER_FORWARD: vfull[is[i]] = vreduced[i]
mode == SCATTER_REVERSE: vreduced[i] = vfull[is[i]]
Index of all Vec routines
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