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

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

  9: int main(int argc,char **argv)
 10: {
 11:   PetscInt       n = 5;
 13:   PetscMPIInt    rank,size;
 14:   IS             ispetsc,isapp;
 15:   AO             ao;

 17:   PetscInitialize(&argc,&argv,(char*)0,help);
 18:   PetscOptionsGetInt(NULL,"-n",&n,NULL);
 19:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 20:   MPI_Comm_size(PETSC_COMM_WORLD,&size);

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

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


 30:   AOView(ao,PETSC_VIEWER_STDOUT_WORLD);

 32:   ISView(ispetsc,PETSC_VIEWER_STDOUT_WORLD);
 33:   ISView(isapp,PETSC_VIEWER_STDOUT_WORLD);
 34:   AOPetscToApplicationIS(ao,ispetsc);
 35:   ISView(isapp,PETSC_VIEWER_STDOUT_WORLD);
 36:   ISView(ispetsc,PETSC_VIEWER_STDOUT_WORLD);


 39:   ISDestroy(&ispetsc);
 40:   ISDestroy(&isapp);

 42:   AODestroy(&ao);
 43:   PetscFinalize();
 44:   return 0;
 45: }