[petsc-users] DMPlex Fortran examples

[Matthew Knepley]

On Tue, Mar 5, 2013 at 2:18 AM, Dharmendar Reddy <dharmareddy84 at gmail.com>wrote:

> Hello,
>          Trying to understand the DMPlexCreateSection first. I have
> created a test case, can you please have a look at it? Actually the code
> has a link error on my system with petsc-dev.  I used DMPlexeCreateBoxMesh
> to create the mesh. Looks like there is no Fortran interface to that
> function. If i comment out the dmplexcreateboxmesh. It does create and
> executable.
>

I pushed a Fortran binding for that function.


> petscDMTest_v2.o: In function `MAIN__':
> petscDMTest_v2.F90:(.text+0x9b): undefined reference to
> `dmplexcreateboxmesh_'
> make: [testDMMeshv2] Error 1 (ignored)
>
> Also, If include finclude/petsc.h90 instead of finclude/petsch.h i get
> compile error :
>

I have also pushed a Fortran binding for this function. You can't use F90
arrays here, but
need normal F77 arrays. We can make a version that uses F90 arrays if that
is what you
need.

   Matt


> petscDMTest_v2.F90(73): error #6691: A pointer dummy argument may only be
> argument a
> ssociated with a pointer.   [NUMCOMP]
>   call DMPlexCreateSection(dmMesh, topologyDim, numField, numComp, numDof,
> &
> ----------------------------------------------------------^
> petscDMTest_v2.F90(73): error #6691: A pointer dummy argument may only be
> argument a
> ssociated with a pointer.   [NUMDOF]
>   call DMPlexCreateSection(dmMesh, topologyDim, numField, numComp, numDof,
> &
> -------------------------------------------------------------------^
> petscDMTest_v2.F90(74): error #6691: A pointer dummy argument may only be
> argument a
> ssociated with a pointer.   [BCFIELD]
>                            numBC, bcField, bcPointIS,section,ierr)
> ----------------------------------^
> petscDMTest_v2.F90(74): error #6691: A pointer dummy argument may only be
> argument a
> ssociated with a pointer.   [BCPOINTIS]
>                            numBC, bcField, bcPointIS,section,ierr)
> -------------------------------------------^
>
> Please have a look at the attached test case and Makefile
>
> On Mon, Mar 4, 2013 at 7:39 PM, Matthew Knepley <knepley at gmail.com> wrote:
>
>> On Mon, Mar 4, 2013 at 7:50 PM, Dharmendar Reddy <dharmareddy84 at gmail.com
>> > wrote:
>>
>>> Hello,
>>>          Is there a DMPlex based fortran example for solving a pde such
>>> as laplace ? Even a c example will do. I am not able to understand the
>>> terminology of chart, cone etc. Is there a paper or user guide to learn
>>> more about the definitions of terms such as chart cone stratum ? I remember
>>> reading a presentation file by mathew about sieve. Is there a newer
>>> tutorial with terminology mapped to the new DMPlex/DMMesh functions.
>>>
>>
>> There is a fully worked out Stokes example (SNES ex62) and a Finite
>> Volume example (TS ex11),
>> and there are a few tests. You should not need much of that stuff for
>> defining a problem. I am
>> writing up a paper about ex11 right now. There is a short manual section
>> on unstructured grids as well.
>>
>> I think the key thing to understand is how to define a data layout over
>> the mesh using a PetscSection.
>> Once that is done, all the DM functions work as normal, and the last hard
>> part is coding your residual
>> loop. I have support for FEM schemes, but its undocumented and slightly
>> complex in order to allow
>> GPU assembly, so you may be more comfortable with your own element loop
>> to start.
>>
>>   Thanks,
>>
>>      Matt
>>
>>
>>> Thanks
>>> Reddy
>>>
>>>
>>> --
>>> -----------------------------------------------------
>>> Dharmendar Reddy Palle
>>> Graduate Student
>>> Microelectronics Research center,
>>> University of Texas at Austin,
>>> 10100 Burnet Road, Bldg. 160
>>> MER 2.608F, TX 78758-4445
>>> e-mail: dharmareddy84 at gmail.com
>>> Phone: +1-512-350-9082
>>> United States of America.
>>> Homepage: https://webspace.utexas.edu/~dpr342
>>>
>>
>>
>>
>> --
>> 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
>>
>
>
>
> --
> -----------------------------------------------------
> Dharmendar Reddy Palle
> Graduate Student
> Microelectronics Research center,
> University of Texas at Austin,
> 10100 Burnet Road, Bldg. 160
> MER 2.608F, TX 78758-4445
> e-mail: dharmareddy84 at gmail.com
> Phone: +1-512-350-9082
> United States of America.
> Homepage: https://webspace.utexas.edu/~dpr342
>



-- 
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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