Actual source code: ex7.c
petsc-3.8.4 2018-03-24
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: }