[petsc-users] How to map global vector to natural vector

[Xu, Donghui]

Thank you, Matt!

From: Matthew Knepley <knepley at gmail.com>
Date: Thursday, November 13, 2025 at 1:28 PM
To: Xu, Donghui <donghui.xu at pnnl.gov>
Cc: petsc-users at mcs.anl.gov <petsc-users at mcs.anl.gov>
Subject: Re: [petsc-users] How to map global vector to natural vector

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Here is the MR:  https://urldefense.us/v3/__https://gitlab.com/petsc/petsc/-/merge_requests/8845__;!!G_uCfscf7eWS!eigadZs4YANflOBAegy-QTp9ga_gDR04kBT3z1MTqB-hieojq_WyFnV_8kjEYFw4cGI5ugeoekJUtEVOobw-94jwWXM$ 

  Thanks,

     Matt

On Tue, Oct 21, 2025 at 4:24 PM Matthew Knepley <knepley at gmail.com<mailto:knepley at gmail.com>> wrote:
I will fix it.

Thanks,

    Matt

On Tue, Oct 21, 2025 at 12:09 PM Xu, Donghui via petsc-users <petsc-users at mcs.anl.gov<mailto:petsc-users at mcs.anl.gov>> wrote:
Dear PETSc Team,

I am working with petsc4py for my model. I had some experience of using PETSc in Fortran. In Fortran, I used the following subroutines:

call DMPlexCreateNaturalVector(dm, natural, ierr)
call DMPlexNaturalToGlobalBegin(dm,natural,X,ierr)
call DMPlexNaturalToGlobalEnd(dm,natural,X,ierr)

However, I found there are no such interfaces in petsc4py. Can you advise me on how to get the global vector in natural order with DMPLEX in petsc4py?

Thanks,
Donghui


--
What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
-- Norbert Wiener

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--
What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
-- Norbert Wiener

https://urldefense.us/v3/__https://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!eigadZs4YANflOBAegy-QTp9ga_gDR04kBT3z1MTqB-hieojq_WyFnV_8kjEYFw4cGI5ugeoekJUtEVOobw-Y8UMmvs$ <https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!eigadZs4YANflOBAegy-QTp9ga_gDR04kBT3z1MTqB-hieojq_WyFnV_8kjEYFw4cGI5ugeoekJUtEVOobw-hCsLqdY$ >
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