static char help[] = "Tests MatMPIBAIJ format in sequential run \n";

#include <petscmat.h>
int main(int argc, char **args)
{
  Mat         A, B;
  PetscInt    i, rstart, rend;
  PetscMPIInt rank, size;
  PetscScalar v;

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &args, NULL, help));
  PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
  PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));

  /* Create a MPIBAIJ matrix */
  PetscCall(MatCreate(PETSC_COMM_WORLD, &A));
  PetscCall(MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, 32, 32));
  PetscCall(MatSetType(A, MATMPIBAIJ));
  PetscCall(MatSeqBAIJSetPreallocation(A, 2, 2, NULL));
  PetscCall(MatMPIBAIJSetPreallocation(A, 2, 2, NULL, 2, NULL));

  v = 1.0;
  PetscCall(MatGetOwnershipRange(A, &rstart, &rend));
  for (i = rstart; i < rend; i++) PetscCall(MatSetValues(A, 1, &i, 1, &i, &v, INSERT_VALUES));
  PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
  PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));

  /* Convert A to AIJ format */
  PetscCall(MatConvert(A, MATAIJ, MAT_INITIAL_MATRIX, &B));

  PetscCall(MatDestroy(&A));
  PetscCall(MatDestroy(&B));
  PetscCall(PetscFinalize());
  return 0;
}

/*TEST

   test:
     output_file: output/empty.out

TEST*/