Actual source code: ex11.c
2: static char help[] = "Tests MatMeshToDual()\n\n";
4: /*T
5: Concepts: Mat^mesh partitioning
6: Processors: n
7: T*/
9: /*
10: Include "petscmat.h" so that we can use matrices.
11: automatically includes:
12: petscsys.h - base PETSc routines petscvec.h - vectors
13: petscmat.h - matrices
14: petscis.h - index sets petscviewer.h - viewers
15: */
16: #include <petscmat.h>
18: int main(int argc,char **args)
19: {
20: Mat mesh,dual;
21: PetscInt Nvertices = 6; /* total number of vertices */
22: PetscInt ncells = 2; /* number cells on this process */
23: PetscInt *ii,*jj;
24: PetscMPIInt size,rank;
25: MatPartitioning part;
26: IS is;
28: PetscInitialize(&argc,&args,(char*)0,help);
29: MPI_Comm_size(MPI_COMM_WORLD,&size);
31: MPI_Comm_rank(MPI_COMM_WORLD,&rank);
33: PetscMalloc1(3,&ii);
34: PetscMalloc1(6,&jj);
35: ii[0] = 0; ii[1] = 3; ii[2] = 6;
36: if (rank == 0) {
37: jj[0] = 0; jj[1] = 1; jj[2] = 2; jj[3] = 1; jj[4] = 2; jj[5] = 3;
38: } else {
39: jj[0] = 1; jj[1] = 4; jj[2] = 5; jj[3] = 1; jj[4] = 3; jj[5] = 5;
40: }
41: MatCreateMPIAdj(MPI_COMM_WORLD,ncells,Nvertices,ii,jj,NULL,&mesh);
42: MatMeshToCellGraph(mesh,2,&dual);
43: MatView(dual,PETSC_VIEWER_STDOUT_WORLD);
45: MatPartitioningCreate(MPI_COMM_WORLD,&part);
46: MatPartitioningSetAdjacency(part,dual);
47: MatPartitioningSetFromOptions(part);
48: MatPartitioningApply(part,&is);
49: ISView(is,PETSC_VIEWER_STDOUT_WORLD);
50: ISDestroy(&is);
51: MatPartitioningDestroy(&part);
53: MatDestroy(&mesh);
54: MatDestroy(&dual);
55: PetscFinalize();
56: return 0;
57: }
59: /*TEST
61: build:
62: requires: parmetis
64: test:
65: nsize: 2
66: requires: parmetis
68: TEST*/