[petsc-users] How to get nodes list refer to unstructure mesh element

[陳宗興]

Thanks for the tip!

Matthew Knepley <knepley at gmail.com> 於 2018年10月12日 週五 下午7:05寫道：

> If you only have cell-vertex meshes, then using the single-layer version
> DMPlexGetCone() is faster.
>
>   Thanks,
>
>      Matt
>
> On Fri, Oct 12, 2018 at 5:56 AM 陳宗興 <barrydog505 at gmail.com> wrote:
>
>> Thanks, I'll check them out.
>>
>> Mark Adams <mfadams at lbl.gov> 於 2018年10月12日 週五 下午5:22寫道：
>>
>>> You want to use DMPlexVecGetClosure:
>>>
>>>
>>> https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/DMPLEX/DMPlexVecGetClosure.html
>>>
>>> The examples shown here don't close cells. What you
>>> want. src/dm/impls/plex/examples/tutorials/ex6.c does iterate over cells,
>>> and get the closure (vertices), which is what you want.
>>>
>>> Mark
>>>
>>>
>>>
>>> On Fri, Oct 12, 2018 at 4:58 AM 陳宗興 <barrydog505 at gmail.com> wrote:
>>>
>>>> Hi all,
>>>>
>>>> I have import a .msh file from DMPlexCreateFromFile.
>>>> I have found DMDAGetElements in DMDA's ex5 having this function,
>>>> how can i do this from DMPlex or unstructure grid.
>>>> Are there any methods that can get nodes list refer to unstructure mesh
>>>> element?
>>>> ------------------------------------
>>>> for example :
>>>>        4
>>>>      /     \
>>>>    /    1   \
>>>>  2 - - - - - 3           element [1]  >> nodes list [2 3 4]
>>>>
>>>> Thanks a lot.
>>>>
>>>> Best regards,
>>>> Barry
>>>>
>>>
>
> --
> 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://www.cse.buffalo.edu/~knepley/
> <http://www.cse.buffalo.edu/~knepley/>
>
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