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

/*T
   Concepts: Mat^mesh partitioning
   Processors: n
T*/

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

int main(int argc,char **args)
{
  Mat             mesh,dual;
  PetscErrorCode  ierr;
  PetscInt        Nvertices = 6;       /* total number of vertices */
  PetscInt        ncells    = 2;       /* number cells on this process */
  PetscInt        *ii,*jj;
  PetscMPIInt     size,rank;
  MatPartitioning part;
  IS              is;

  ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr;
  ierr = MPI_Comm_size(MPI_COMM_WORLD,&size);CHKERRMPI(ierr);
  if (size != 2) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP,"This example is for exactly two processes");
  ierr = MPI_Comm_rank(MPI_COMM_WORLD,&rank);CHKERRMPI(ierr);

  ierr  = PetscMalloc1(3,&ii);CHKERRQ(ierr);
  ierr  = PetscMalloc1(6,&jj);CHKERRQ(ierr);
  ii[0] = 0; ii[1] = 3; ii[2] = 6;
  if (rank == 0) {
    jj[0] = 0; jj[1] = 1; jj[2] = 2; jj[3] = 1; jj[4] = 2; jj[5] = 3;
  } else {
    jj[0] = 1; jj[1] = 4; jj[2] = 5; jj[3] = 1; jj[4] = 3; jj[5] = 5;
  }
  ierr = MatCreateMPIAdj(MPI_COMM_WORLD,ncells,Nvertices,ii,jj,NULL,&mesh);CHKERRQ(ierr);
  ierr = MatMeshToCellGraph(mesh,2,&dual);CHKERRQ(ierr);
  ierr = MatView(dual,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr);

  ierr = MatPartitioningCreate(MPI_COMM_WORLD,&part);CHKERRQ(ierr);
  ierr = MatPartitioningSetAdjacency(part,dual);CHKERRQ(ierr);
  ierr = MatPartitioningSetFromOptions(part);CHKERRQ(ierr);
  ierr = MatPartitioningApply(part,&is);CHKERRQ(ierr);
  ierr = ISView(is,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr);
  ierr = ISDestroy(&is);CHKERRQ(ierr);
  ierr = MatPartitioningDestroy(&part);CHKERRQ(ierr);

  ierr = MatDestroy(&mesh);CHKERRQ(ierr);
  ierr = MatDestroy(&dual);CHKERRQ(ierr);
  ierr = PetscFinalize();
  return ierr;
}

/*TEST

   build:
     requires: parmetis

   test:
      nsize: 2
      requires: parmetis

TEST*/