<html dir="ltr"><head></head><body style="text-align:left; direction:ltr;"><div>Hi, Matt:</div><div> Is the code in following page?</div><div><br></div><div> /petsc-master/src/snes/examples/tutorials/ex12.c.html</div><div><br></div><div> Thanks</div><div>leejearl</div><div><br></div><div>On Thu, 2018-12-06 at 20:26 -0500, Matthew Knepley wrote:</div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div dir="ltr"><div class="gmail_quote"><div dir="ltr">On Thu, Dec 6, 2018 at 8:06 PM leejearl <<a href="mailto:leejearl@mail.nwpu.edu.cn">leejearl@mail.nwpu.edu.cn</a>> wrote:<br></div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div style="text-align:left;direction:ltr"><div>Hi Matt:</div><div> Thank you for your helps. I want to implement the periodic boundary in dmplex. For a cell or face, the donor cell or face might be not distributed in the same local dm. Maybe I should ask that how</div><div>can I implement the topology of the periodic boundary in demplex.</div></div><br></blockquote><div><br></div><div>Plex directly encodes a periodic topology. For example, with a circle, each vertex is connected</div><div>to two neighbors. There are example with periodic boundary conditions like SNES ex12.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div style="text-align:left;direction:ltr"><div> Thanks again for your kind reply.</div><div><br></div><div>leejearl</div><div>On Thu, 2018-12-06 at 12:02 -0500, Matthew Knepl</div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div class="gmail_quote"><div dir="ltr">On Thu, Dec 6, 2018 at 9:47 AM leejearl via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a>> wrote:<br></div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex">Hi, Petsc developer:<br>
I have a problem for helps. <br>
There is a dmplex object, and I have distribute it use the<br>
routine DMPlexDistribute(). Then, I want to get the global integer ids<br>
in the label "Face Sets". The code is as follow,<br>
<br>
ierr = DMGetLabelIdIS(dm, "Face Sets", &bcIdIS);CHKERRQ(ierr);<br>
<br>
The values of bcIdIs are the local integer ids. How can I get the<br>
global integer ids.<br>
<br>
The problem also can be described as follow. The global ids might look<br>
likes<br>
<br>
IS Object: 1 MPI processes<br>
type: general<br>
Number of indices in set 4<br>
0 1<br>
1 4<br>
2 3<br>
3 2<br>
<br>
But after the dm is distributed, I can only get the local ids as follow<br>
using the routine "DMGetLabelIdIS" <br>
<br>
IS Object: 1 MPI processes<br>
type: general<br>
[0] Number of indices in set 3<br>
[0] 0 1<br>
[0] 1 2<br>
[0] 2 4<br>
<br>
How can I get the global integer ids in a label after the dm is<br>
distributed?<br>
<br>
Any helps are appreciate! <br></blockquote><div><br></div><div>You can make a conversion from local point numbers to global point numbers using</div><div><br></div><div> <a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/DMPLEX/DMPlexCreatePointNumbering.html" target="_blank">https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/DMPLEX/DMPlexCreatePointNumbering.html</a></div><div><br></div><div>You could even make a replacement DMLabel with the global point numbers, but I think the win would be small</div><div>or nonexistent for most cases.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex">
Thanks<br>
<br>
leejearl<br>
<br>
<br>
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