static char help[] = "Test saving SeqSBAIJ matrix that is missing diagonal entries.";

#include <petscmat.h>

int main(int argc, char **args)
{
  Mat         A;
  PetscInt    bs = 3, m = 4, i, j, val = 10, row[2], col[3], rstart;
  PetscMPIInt size;
  PetscScalar x[6][9];

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &args, NULL, help));
  PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
  PetscCheck(size == 1, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, "Test is only for sequential");
  PetscCall(MatCreateSeqSBAIJ(PETSC_COMM_SELF, bs, m * bs, m * bs, 1, NULL, &A));
  PetscCall(MatSetOption(A, MAT_IGNORE_LOWER_TRIANGULAR, PETSC_TRUE));
  rstart = 0;

  row[0] = rstart + 0;
  row[1] = rstart + 2;
  col[0] = rstart + 0;
  col[1] = rstart + 1;
  col[2] = rstart + 3;
  for (i = 0; i < 6; i++) {
    for (j = 0; j < 9; j++) x[i][j] = (PetscScalar)val++;
  }
  PetscCall(MatSetValuesBlocked(A, 2, row, 3, col, &x[0][0], INSERT_VALUES));
  PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
  PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));
  PetscCall(MatView(A, PETSC_VIEWER_BINARY_WORLD));

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