[petsc-users] Union of sequential vecs

[Karthikeyan Chockalingam - STFC UKRI]

That is where I am stuck, I don’t know who to combine them to get Vec = {2,5,7,8,10,11,12}.
I just want them in an MPI vector.

I finally plan to call VecScatterCreateToAll so that all processor gets a copy.

Thank you.

Kind regards,
Karthik.

From: Barry Smith <bsmith at petsc.dev>
Date: Friday, 9 December 2022 at 20:04
To: Chockalingam, Karthikeyan (STFC,DL,HC) <karthikeyan.chockalingam at stfc.ac.uk>
Cc: petsc-users at mcs.anl.gov <petsc-users at mcs.anl.gov>
Subject: Re: [petsc-users] Union of sequential vecs

  How are you combining them to get Vec = {2,5,7,8,10,11,12}?

  Do you want the values to remain on the same MPI rank as before, just in an MPI vector?




On Dec 9, 2022, at 2:28 PM, Karthikeyan Chockalingam - STFC UKRI via petsc-users <petsc-users at mcs.anl.gov> wrote:

Hi,

I want to take the union of a set of sequential vectors, each living in a different processor.

Say,
Vec_Seq1 = {2,5,7}
Vec_Seq2 = {5,8,10,11}
Vec_Seq3 = {5,2,12}.

Finally, get the union of all them Vec = {2,5,7,8,10,11,12}.

I initially wanted to create a parallel vector and insert the (sequential vector) values but I do not know, to which index to insert the values to. But I do know the total size of Vec (which in this case is 7).

Any help is much appreciated.

Kind regards,
Karthik.




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