1: #include "petsc/finclude/petsc.h"
  2: program ex47f90
  3:   use petsc
  4:   implicit none

  6:   type(tDM)                         :: dm
  7:   type(tPetscSection)               :: section
  8:   character(len=PETSC_MAX_PATH_LEN) :: IOBuffer
  9:   PetscInt                          :: dof, p, pStart, pEnd, d
 10:   type(tVec)                        :: v
 11:   PetscInt                          :: zero = 0
 12:   PetscInt                          :: one = 1
 13:   PetscInt                          :: two = 2
 14:   PetscScalar, dimension(:), pointer  :: val
 15:   PetscScalar, pointer              :: x(:)
 16:   PetscErrorCode                    :: ierr

 18:   PetscCallA(PetscInitialize(ierr))

 20:   PetscCallA(DMCreate(PETSC_COMM_WORLD, dm, ierr))
 21:   PetscCallA(DMSetType(dm, DMPLEX, ierr))
 22:   PetscCallA(DMSetFromOptions(dm, ierr))
 23:   PetscCallA(DMViewFromOptions(dm, PETSC_NULL_OBJECT, '-d_view', ierr))

 25:   PetscCallA(PetscSectionCreate(PETSC_COMM_WORLD, section, ierr))
 26:   PetscCallA(DMPlexGetChart(dm, pStart, pEnd, ierr))
 27:   PetscCallA(PetscSectionSetChart(section, pStart, pEnd, ierr))
 28:   PetscCallA(DMPlexGetHeightStratum(dm, zero, pStart, pEnd, ierr))
 29:   do p = pStart, pEnd - 1
 30:     PetscCallA(PetscSectionSetDof(section, p, one, ierr))
 31:   end do
 32:   PetscCallA(DMPlexGetDepthStratum(dm, zero, pStart, pEnd, ierr))
 33:   do p = pStart, pEnd - 1
 34:     PetscCallA(PetscSectionSetDof(section, p, two, ierr))
 35:   end do
 36:   PetscCallA(PetscSectionSetUp(section, ierr))
 37:   PetscCallA(DMSetLocalSection(dm, section, ierr))
 38:   PetscCallA(PetscSectionViewFromOptions(section, PETSC_NULL_OBJECT, '-s_view', ierr))

 40:   PetscCallA(DMCreateGlobalVector(dm, v, ierr))

 42:   PetscCallA(DMPlexGetChart(dm, pStart, pEnd, ierr))
 43:   do p = pStart, pEnd - 1
 44:     PetscCallA(PetscSectionGetDof(section, p, dof, ierr))
 45:     allocate (val(dof))
 46:     do d = 1, dof
 47:       val(d) = 100*p + d - 1
 48:     end do
 49:     PetscCallA(VecSetValuesSection(v, section, p, val, INSERT_VALUES, ierr))
 50:     deallocate (val)
 51:   end do
 52:   PetscCallA(VecView(v, PETSC_VIEWER_STDOUT_WORLD, ierr))

 54:   do p = pStart, pEnd - 1
 55:     PetscCallA(PetscSectionGetDof(section, p, dof, ierr))
 56:     PetscCallA(VecGetValuesSection(v, section, p, x, ierr))
 57:     write (IOBuffer, *) 'Point ', p, ' dof ', dof, '\n'
 58:     PetscCallA(PetscPrintf(PETSC_COMM_SELF, IOBuffer, ierr))
 59:     PetscCallA(VecRestoreValuesSection(v, section, p, x, ierr))
 60:   end do

 62:   PetscCallA(PetscSectionDestroy(section, ierr))
 63:   PetscCallA(VecDestroy(v, ierr))
 64:   PetscCallA(DMDestroy(dm, ierr))
 65:   PetscCallA(PetscFinalize(ierr))
 66: end program ex47f90

 68: !/*TEST
 69: !
 70: !  test:
 71: !    suffix: 0
 72: !    args: -dm_plex_filename ${wPETSC_DIR}/share/petsc/datafiles/meshes/quads-q2.msh
 73: !
 74: !TEST*/