[petsc-users] VecScatter in 'add' mode?

[Hui Zhang]

Hi all,
When using
PetscErrorCode  VecScatterCreate(Vec xin,IS ix,Vec yin,IS iy,VecScatter *newctx)
I want to add those values of xin to the original values of yin.
Is there a way to do this without copy of yin?
Thanks!
Hui

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