2: static char help[] = "Demonstrates constructing an application ordering.\n\n";

  4:  #include <petscao.h>
  5:  #include <petscviewer.h>

  7: int main(int argc,char **argv)
  8: {
  9:   PetscInt       n = 5;
 11:   PetscMPIInt    rank,size;
 12:   IS             ispetsc,isapp;
 13:   AO             ao;

 15:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
 16:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
 17:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 18:   MPI_Comm_size(PETSC_COMM_WORLD,&size);

 20:   /* create the index sets */
 21:   ISCreateStride(PETSC_COMM_WORLD,n,rank,size,&ispetsc);
 22:   ISCreateStride(PETSC_COMM_WORLD,n,n*rank,1,&isapp);

 24:   /* create the application ordering */
 25:   AOCreateBasicIS(isapp,ispetsc,&ao);


 28:   AOView(ao,PETSC_VIEWER_STDOUT_WORLD);

 30:   ISView(ispetsc,PETSC_VIEWER_STDOUT_WORLD);
 31:   ISView(isapp,PETSC_VIEWER_STDOUT_WORLD);
 32:   AOPetscToApplicationIS(ao,ispetsc);
 33:   ISView(isapp,PETSC_VIEWER_STDOUT_WORLD);
 34:   ISView(ispetsc,PETSC_VIEWER_STDOUT_WORLD);


 37:   ISDestroy(&ispetsc);
 38:   ISDestroy(&isapp);

 40:   AODestroy(&ao);
 41:   PetscFinalize();
 42:   return ierr;
 43: }

 45: /*TEST

 47:    test:
 48:       nsize: 2

 50: TEST*/