2: static char help[] = "Tests MatMeshToDual()\n\n";

  4: /*
  5:   Include "petscmat.h" so that we can use matrices.
  6:   automatically includes:
  7:      petscsys.h       - base PETSc routines   petscvec.h    - vectors
  8:      petscmat.h    - matrices
  9:      petscis.h     - index sets            petscviewer.h - viewers
 10: */
 11: #include <petscmat.h>

 13: int main(int argc,char **args)
 14: {
 15:   Mat             mesh,dual;
 16:   PetscInt        Nvertices = 6;       /* total number of vertices */
 17:   PetscInt        ncells    = 2;       /* number cells on this process */
 18:   PetscInt        *ii,*jj;
 19:   PetscMPIInt     size,rank;
 20:   MatPartitioning part;
 21:   IS              is;

 23:   PetscInitialize(&argc,&args,(char*)0,help);
 24:   MPI_Comm_size(MPI_COMM_WORLD,&size);
 26:   MPI_Comm_rank(MPI_COMM_WORLD,&rank);

 28:   PetscMalloc1(3,&ii);
 29:   PetscMalloc1(6,&jj);
 30:   ii[0] = 0; ii[1] = 3; ii[2] = 6;
 31:   if (rank == 0) {
 32:     jj[0] = 0; jj[1] = 1; jj[2] = 2; jj[3] = 1; jj[4] = 2; jj[5] = 3;
 33:   } else {
 34:     jj[0] = 1; jj[1] = 4; jj[2] = 5; jj[3] = 1; jj[4] = 3; jj[5] = 5;
 35:   }
 36:   MatCreateMPIAdj(MPI_COMM_WORLD,ncells,Nvertices,ii,jj,NULL,&mesh);
 37:   MatMeshToCellGraph(mesh,2,&dual);
 38:   MatView(dual,PETSC_VIEWER_STDOUT_WORLD);

 40:   MatPartitioningCreate(MPI_COMM_WORLD,&part);
 41:   MatPartitioningSetAdjacency(part,dual);
 42:   MatPartitioningSetFromOptions(part);
 43:   MatPartitioningApply(part,&is);
 44:   ISView(is,PETSC_VIEWER_STDOUT_WORLD);
 45:   ISDestroy(&is);
 46:   MatPartitioningDestroy(&part);

 48:   MatDestroy(&mesh);
 49:   MatDestroy(&dual);
 50:   PetscFinalize();
 51:   return 0;
 52: }

 54: /*TEST

 56:    build:
 57:      requires: parmetis

 59:    test:
 60:       nsize: 2
 61:       requires: parmetis

 63: TEST*/