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<div>Hi,</div>
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<div>You can simply is VecISCopy.</div>
Have a look at the construction of isU and friends at ex26.c:291, and calls to VecISCopy around line 357.
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<div>Blaise</div>
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<div>On Apr 17, 2023, at 6:54 PM, James Wright <jrwrigh.iii@gmail.com> wrote:</div>
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<div class="gmail_default" style="font-family:georgia,serif">Thanks for the reply! The `Vec`s are created through DMs, not sections, but DMPlex uses sections, so I think this still applies. Super/Sub `DM`s sounds like a good solution. The only thing that I'm
not seeing in the examples is being able to take `Vec` data from one a sub `DM`'s `Vec` to a super `DM`'s `Vec`.<br>
<br>
To be a bit more explicit, let's say I have 3 fields, A, B, C. I'm imagining creating a "main" `DM` with those fields and then creating sub `DM`s, dmA, dmB, dmC. I need to have, in a single `Vec` fields B and C, A and C together. So I'd create two super DMs
dm_AC and dm_BC.<br>
<br>
If I have a global `Vec` on dm_BC, is it possible that I can get the C data onto a dm_AC `Vec`? I think I could using SubVectors and VecISCopy, but am not entirely sure. There doesn't appear to be an example in the tutorials anywhere that puts these pieces
together in this way.</div>
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<div class="gmail_default" style="font-family:georgia,serif"><br>
Thanks,</div>
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<div style="color:rgb(80,0,80);font-family:georgia,serif"><span style="font-size: 12.8px;">James Wright</span></div>
<div style="color:rgb(80,0,80)"><font size="1" face="georgia, serif">Graduate Research Assistant, PhD</font><span>
<div style="font-size:12.8px"><font size="1" face="georgia, serif">University of Colorado Boulder<br>
</font></div>
<div style="font-size:12.8px"><font size="1"><font face="georgia, serif">Cell: </font><font face="times new roman, serif">(864) 498 8869 </font></font></div>
<div style="color:rgb(34,34,34);font-size:12.8px"><font size="1" face="georgia, serif">Email:
<a href="mailto:james@jameswright.xyz" target="_blank">james@jameswright.xyz</a></font></div>
<div style="color:rgb(34,34,34);font-size:12.8px"><span style="font-family:georgia,serif;font-size:x-small">Website:
<a href="https://www.jameswright.xyz/" target="_blank">jameswright.xyz</a></span><br>
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</span></div>
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<div dir="ltr" class="gmail_attr">On Mon, Apr 17, 2023 at 12:42 PM Blaise Bourdin <<a href="mailto:bourdin@mcmaster.ca">bourdin@mcmaster.ca</a>> wrote:<br>
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<div>Hi,</div>
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<div>If you have created your vectors using sections, all you need is to call DMCreateSuperDM. See src/dm/impls/plex/tests/ex26.c:300 for an example.</div>
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<div>Blaise</div>
<div><br>
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<div>On Apr 17, 2023, at 1:30 PM, James Wright <<a href="mailto:jrwrigh.iii@gmail.com" target="_blank">jrwrigh.iii@gmail.com</a>> wrote:</div>
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<div class="gmail_default" style="font-family:georgia,serif">Hello,<br>
<br>
I currently have two DMPlex objects, both `DMClone`ed from the same "original" DMPlex object. They have different fields with different numbers of components on each of them. I would like to compose certain components from each into a single contiguous array.
I'd also like to do this from a DMGlobal vector. What is the best/most robust way to do that?<br>
<br>
Obviously I can just `VecGetArrayRead` each of the vectors and loop through them manually, but that relies on knowledge of the array data layout. There's `DMPlexGetLocalOffsets`, but since I want to use the global Vec, there isn't a corresponding `DMPlexGetGlobalOffsets`
(that I can see anyways). This manually looping would also require that the underlying arrangement of the DOFs is the same between the two DMPlex objects, but I assume this is true from the `DMClone` operation.<br>
<br>
Thanks,<br>
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<div style="color:rgb(80,0,80);font-family:georgia,serif"><span style="font-size:12.8px">James Wright</span></div>
<div style="color:rgb(80,0,80)"><font size="1" face="georgia, serif">Graduate Research Assistant, PhD</font><span>
<div style="font-size:12.8px"><font size="1" face="georgia, serif">University of Colorado Boulder<br>
</font></div>
<div style="font-size:12.8px"><font size="1"><font face="georgia, serif">Cell: </font><font face="times new roman, serif">(864) 498 8869 </font></font></div>
<div style="color:rgb(34,34,34);font-size:12.8px"><font size="1" face="georgia, serif">Email:
<a href="mailto:james@jameswright.xyz" target="_blank">james@jameswright.xyz</a></font></div>
<div style="color:rgb(34,34,34);font-size:12.8px"><span style="font-family:georgia,serif;font-size:x-small">Website:
<a href="https://www.jameswright.xyz/" target="_blank">jameswright.xyz</a></span><br>
</div>
</span></div>
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<div>— <br>
Canada Research Chair in Mathematical and Computational Aspects of Solid Mechanics (Tier 1)</div>
<div>Professor, Department of Mathematics & Statistics<br>
Hamilton Hall room 409A, McMaster University<br>
1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada <br>
<a href="https://www.math.mcmaster.ca/bourdin" target="_blank">https://www.math.mcmaster.ca/bourdin</a> | +1 (905) 525 9140 ext. 27243</div>
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<div>— <br>
Canada Research Chair in Mathematical and Computational Aspects of Solid Mechanics (Tier 1)</div>
<div>Professor, Department of Mathematics & Statistics<br>
Hamilton Hall room 409A, McMaster University<br>
1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada <br>
https://www.math.mcmaster.ca/bourdin | +1 (905) 525 9140 ext. 27243</div>
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