On Tue, Jun 22, 2010 at 12:59 PM, Mark Cheeseman < mark.cheeseman at kaust.edu.sa> wrote:
> Hi, > > I am trying to write a PETSc program in FORTRAN90 where I need to update a > single value in a global distributed array. I know the global coordinates > of the position that needs to be updated in the global array but I cannot > get the mapping from the local vector correct. In this case, I am working > on a domain with global dimensions [arraysize(1),arraysize(2),arraysize(3)] > and I want to alter a single point in the global distributed array, uGLOBAL, > at the global position [arraysize(1)/2-1,arraysize(2)-1,3]. I cannot seem > to be able to do this... what am I doing wrong? > > ... > DA da > Vec uGLOBAL, uLOCAL, tmp > PetscErrorCode ierr > PetscScalar, pointer :: xx > PetscInt rank, source_rank, i,j,k, row > > .... > > call MPI_Comm_rank( PETSC_COMM_WORLD, rank, ierr ) > call DACreate3d( PETSC_COMM_WORLD, DA_NONPERIODIC, DA_STENCIL_BOX, & > arraysize(1), arraysize(2), arraysize(3), > PETSC_DECIDE, & > PETSC_DECIDE, PETSC_DECIDE, 1, 5, > PETSC_NULL_INTEGER, & > PETSC_NULL_INTEGER, PETSC_NULL_INTEGER, da, ierr) > call DACreateGlobalVector( da, pNOW, ierr ) > call DAGetCorners( da, xs, ys, zs, xl, yl, zl, ierr ) > call DAVecGetArrayF90() > do i = xs,xs+xl-1 > if ( i.eq.arraysize(1)/2-1 ) then > do j = ys,ys+yl-1 > if ( j.eq.arraysize(2)/2-1 ) then > do k = zs,zs+zl-1 > if ( k.eq.3 ) then > array(k,j,i) = pressure > endif > enddo > endif > enddo > endif > enddo > > call DAVecRestoreArrayF90() That should work. Matt Thank you, > Mark > > -- > Mark Patrick Cheeseman > > Computational Scientist > KSL (KAUST Supercomputing Laboratory) > Building 1, Office #126 > King Abdullah University of Science & Technology > Thuwal 23955-6900 > Kingdom of Saudi Arabia > > EMAIL : mark.cheeseman at kaust.edu.sa > PHONE : +966 (2) 808 0221 (office) > +966 (54) 470 1082 (mobile) > SKYPE : mark.patrick.cheeseman > -- 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20100622/cf2afc9b/attachment.htm>