On Tue, Feb 20, 2018 at 12:30 PM, Danyang Su <danyang...@gmail.com> wrote:
> Hi All, > > I tried to compile the DMPlexCreateSection code but got error information > as shown below. > > Error: Symbol 'petsc_null_is' at (1) has no IMPLICIT type > > I tried to use PETSC_NULL_OBJECT instead of PETSC_NULL_IS, then the code > can be compiled but run into Segmentation Violation error in > DMPlexCreateSection. > >From the webpage http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/DMPLEX/DMPlexCreateSection.html The F90 version is DMPlexCreateSectionF90. Doing this with F77 arrays would have been too painful. Thanks, Matt > dmda_flow%da is distributed dm object that works fine. > > The fortran example I follow is http://www.mcs.anl.gov/petsc/ > petsc-dev/src/dm/impls/plex/examples/tutorials/ex1f90.F90. > > What parameters should I use if passing null to bcField, bcComps, bcPoints > and perm. > > PetscErrorCode > <https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/Vec/PetscErrorCode.html#PetscErrorCode> > DMPlexCreateSection > <https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/DMPLEX/DMPlexCreateSection.html#DMPlexCreateSection>(DM > <https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/DM/DM.html#DM> > dm, PetscInt > <https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/Vec/PetscInt.html#PetscInt> > dim, PetscInt > <https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/Vec/PetscInt.html#PetscInt> > numFields,const PetscInt > <https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/Vec/PetscInt.html#PetscInt> > numComp[],const PetscInt > <https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/Vec/PetscInt.html#PetscInt> > numDof[], PetscInt > <https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/Vec/PetscInt.html#PetscInt> > numBC,const PetscInt > <https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/Vec/PetscInt.html#PetscInt> > bcField[], > const IS > <https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/IS/IS.html#IS> > bcComps[], const IS > <https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/IS/IS.html#IS> > bcPoints[], IS > <https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/IS/IS.html#IS> > perm, PetscSection > <https://www.mcs.anl.gov/petsc/petsc-master/docs/manualpages/IS/PetscSection.html#PetscSection> > *section) > > > #include <petsc/finclude/petscis.h> > #include <petsc/finclude/petscis.h90> > #include <petsc/finclude/petscdmplex.h> > > ... > > #ifdef USG > numFields = 1 > numComp(1) = 1 > pNumComp => numComp > > do i = 1, numFields*(dmda_flow%dim+1) > numDof(i) = 0 > end do > numDof(0*(dmda_flow%dim+1)+1) = dmda_flow%dof > pNumDof => numDof > > numBC = 0 > > call DMPlexCreateSection(dmda_flow%da,dmda_flow%dim, & > numFields,pNumComp,pNumDof, > & > numBC,PETSC_NULL_INTEGER, > & > PETSC_NULL_IS,PETSC_NULL_IS, > & !Error here > PETSC_NULL_IS,section,ierr) > CHKERRQ(ierr) > > call PetscSectionSetFieldName(section,0,'flow',ierr) > CHKERRQ(ierr) > > call DMSetDefaultSection(dmda_flow%da,section,ierr) > CHKERRQ(ierr) > > call PetscSectionDestroy(section,ierr) > CHKERRQ(ierr) > #endif > > Thanks, > > Danyang > -- 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.caam.rice.edu/~mk51/>
