2: static char help[] = "Tests various 1-dimensional DMDA routines.\n\n";

  4:  #include <petscdm.h>
  5:  #include <petscdmda.h>
  6:  #include <petscdraw.h>

  8: int main(int argc,char **argv)
  9: {
 10:   PetscMPIInt            rank;
 11:   PetscInt               M  = 13,s=1,dof=1;
 12:   DMBoundaryType         bx = DM_BOUNDARY_PERIODIC;
 13:   PetscErrorCode         ierr;
 14:   DM                     da;
 15:   PetscViewer            viewer;
 16:   Vec                    local,global;
 17:   PetscScalar            value;
 18:   PetscDraw              draw;
 19:   PetscBool              flg = PETSC_FALSE;
 20:   ISLocalToGlobalMapping is;

 22:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
 23:   PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",280,480,600,200,&viewer);
 24:   PetscViewerDrawGetDraw(viewer,0,&draw);
 25:   PetscDrawSetDoubleBuffer(draw);

 27:   /* Readoptions */
 28:   PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL);
 29:   PetscOptionsGetEnum(NULL,NULL,"-wrap",DMBoundaryTypes,(PetscEnum*)&bx,NULL);
 30:   PetscOptionsGetInt(NULL,NULL,"-dof",&dof,NULL);
 31:   PetscOptionsGetInt(NULL,NULL,"-s",&s,NULL);

 33:   /* Create distributed array and get vectors */
 34:   DMDACreate1d(PETSC_COMM_WORLD,bx,M,dof,s,NULL,&da);
 35:   DMSetFromOptions(da);
 36:   DMSetUp(da);
 37:   DMView(da,viewer);
 38:   DMCreateGlobalVector(da,&global);
 39:   DMCreateLocalVector(da,&local);

 41:   value = 1;
 42:   VecSet(global,value);

 44:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 45:   value = rank+1;
 46:   VecScale(global,value);

 48:   VecView(global,viewer);
 49:   PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_WORLD,"\nGlobal Vector:\n");
 50:   VecView(global,PETSC_VIEWER_STDOUT_WORLD);
 51:   PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_WORLD,"\n");

 53:   /* Send ghost points to local vectors */
 54:   DMGlobalToLocalBegin(da,global,INSERT_VALUES,local);
 55:   DMGlobalToLocalEnd(da,global,INSERT_VALUES,local);

 57:   PetscOptionsGetBool(NULL,NULL,"-local_print",&flg,NULL);
 58:   if (flg) {
 59:     PetscViewer            sviewer;

 61:     PetscViewerASCIIPushSynchronized(PETSC_VIEWER_STDOUT_WORLD);
 62:     PetscViewerASCIISynchronizedPrintf(PETSC_VIEWER_STDOUT_WORLD,"\nLocal Vector: processor %d\n",rank);
 63:     PetscViewerGetSubViewer(PETSC_VIEWER_STDOUT_WORLD,PETSC_COMM_SELF,&sviewer);
 64:     VecView(local,sviewer);
 65:     PetscViewerRestoreSubViewer(PETSC_VIEWER_STDOUT_WORLD,PETSC_COMM_SELF,&sviewer);
 66:     PetscViewerFlush(PETSC_VIEWER_STDOUT_WORLD);
 67:     PetscViewerASCIIPopSynchronized(PETSC_VIEWER_STDOUT_WORLD);
 68:   }
 69:   PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_WORLD,"\nLocal to global mapping\n");
 70:   DMGetLocalToGlobalMapping(da,&is);
 71:   ISLocalToGlobalMappingView(is,PETSC_VIEWER_STDOUT_WORLD);

 73:   /* Free memory */
 74:   PetscViewerDestroy(&viewer);
 75:   VecDestroy(&global);
 76:   VecDestroy(&local);
 77:   DMDestroy(&da);
 78:   PetscFinalize();
 79:   return ierr;
 80: }