Actual source code: ex7f.F
petsc-3.4.2 2013-07-02

      1: !
      2: !
      3:        subroutine ex7f(vec,comm)

      5: #include <finclude/petscsys.h>
      6: #include <finclude/petscvec.h>
      7: !
      8: !  This routine demonstates how a computational module may be written
      9: !  in Fortran and called from a C routine, passing down PETSc objects.
     10: !

     12:        PetscScalar      two
     13:        Vec              vec
     14:        MPI_Comm         comm
     15:        PetscErrorCode ierr
     16:        PetscMPIInt rank

     18:        two  = 2.0

     20: !
     21: !     The Objects vec,comm created in a C routine are now
     22: !     used in fortran routines.
     23: !
     24:        call VecSet(vec,two,ierr)
     25:        call MPI_Comm_rank(comm,rank,ierr)
     26:        call MPI_Comm_rank(PETSC_COMM_WORLD,rank,ierr)

     28: !
     29: !  Now call C routine from Fortran, passing in the vector, communicator
     30: !
     31:        call ex7c(vec,comm,ierr)
     32: !
     33: !     IO from the fortran routines may cause all kinds of
     34: !
     35: ! 100   format ('[',i1,']',' Calling VecView from Fortran')
     36: !       write(6,100) rank
     37: !
     38: !  Now Call a Petsc Routine from Fortran
     39: !
     40:        call VecView(vec,PETSC_VIEWER_STDOUT_WORLD,ierr)
     41:        return
     42:        end