[petsc-users] How to use PetscViewerVTKGetDM

[Matthew Knepley]

On Fri, Nov 2, 2018 at 1:06 PM 陳宗興 <barrydog505 at gmail.com> wrote:

> I want to create a VTK file with DMPlex and Vec, and I found these
> function:
> PetscViewerVTKOpen,
>

Call VTKOpen() to get a PetscViewer object


> PetscViewerVTKGetDM, and PetscViewerVTKWriteFunction
>

Forget these.

Call VecView(v, viewer) with your Vec and VTK Viewer.

  Thanks,

      Matt


> Are these what I needed, or maybe something else?
>
> thank you,
>
> Barry
>
> Matthew Knepley <knepley at gmail.com> 於 2018年11月3日 週六 上午12:14寫道：
>
>> On Fri, Nov 2, 2018 at 12:11 PM 陳宗興 via petsc-users <
>> petsc-users at mcs.anl.gov> wrote:
>>
>>> Hi,
>>>
>>> I have created a DMPlex using DMPlexCreateFromFile,
>>> and I use PetscObjectSetName to create the name of DM.
>>> I have occurred some problem when I try to use PetscViewerVTKGetDM.
>>> This is what I write:
>>>
>>>      DM   dm;
>>>      ...
>>>      PetscObjectSetName((PetscObject) dm, "Mesh");
>>>      ...
>>>      PetscViewerVTKGetDM(viewer, (PetscObject) dm);
>>>
>>
>> 1) GetDM() returns a DM, so you would need PetscViewerVTKGetDM(viewer,
>> (PetscObject *) &dm)
>>
>> 2) However, why are you trying to pull out a DM? It does not look like
>> you want to do this.
>>
>>   Thanks,
>>
>>     Matt
>>
>>
>>> And here is the output of waring:
>>>      warning: passing argument 2 of ‘PetscViewerVTKGetDM’ from
>>> incompatible pointer type [-Wincompatible-pointer-types]
>>>      ierr = PetscViewerVTKGetDM(viewer, (PetscObject) dm);CHKERRQ(ierr);
>>>                                                                   ^
>>>      note: expected ‘struct _p_PetscObject **’ but argument is of type
>>> ‘struct _p_PetscObject *'
>>>      PETSC_EXTERN PetscErrorCode
>>> PetscViewerVTKGetDM(PetscViewer,PetscObject*);
>>>
>>>  ^~~~~~~~~~~~~~~~~~~
>>>
>>> How can I fix it?
>>>
>>> Thank you,
>>>
>>> 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/>
>>
>

-- 
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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