static char help[] = "Tests various routines in MatMAIJ format.\n";

#include <petscmat.h>
#define IMAX 15
int main(int argc, char **args)
{
  Mat         A, B, MA;
  PetscViewer fd;
  char        file[PETSC_MAX_PATH_LEN];
  PetscInt    m, n, M, N, dof = 1;
  PetscMPIInt rank, size;
  PetscBool   flg;

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

  /* Load aij matrix A */
  PetscCall(PetscOptionsGetString(NULL, NULL, "-f", file, sizeof(file), &flg));
  PetscCheck(flg, PETSC_COMM_WORLD, PETSC_ERR_USER, "Must indicate binary file with the -f option");
  PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, file, FILE_MODE_READ, &fd));
  PetscCall(MatCreate(PETSC_COMM_WORLD, &A));
  PetscCall(MatLoad(A, fd));
  PetscCall(PetscViewerDestroy(&fd));

  /* Get dof, then create maij matrix MA */
  PetscCall(PetscOptionsGetInt(NULL, NULL, "-dof", &dof, NULL));
  PetscCall(MatCreateMAIJ(A, dof, &MA));
  PetscCall(MatGetLocalSize(MA, &m, &n));
  PetscCall(MatGetSize(MA, &M, &N));

  if (size == 1) {
    PetscCall(MatConvert(MA, MATSEQAIJ, MAT_INITIAL_MATRIX, &B));
  } else {
    PetscCall(MatConvert(MA, MATMPIAIJ, MAT_INITIAL_MATRIX, &B));
  }

  /* Test MatMult() */
  PetscCall(MatMultEqual(MA, B, 10, &flg));
  PetscCheck(flg, PETSC_COMM_WORLD, PETSC_ERR_CONV_FAILED, "Error: MatMul() for MAIJ matrix");
  /* Test MatMultAdd() */
  PetscCall(MatMultAddEqual(MA, B, 10, &flg));
  PetscCheck(flg, PETSC_COMM_WORLD, PETSC_ERR_CONV_FAILED, "Error: MatMulAdd() for MAIJ matrix");

  /* Test MatMultTranspose() */
  PetscCall(MatMultTransposeEqual(MA, B, 10, &flg));
  PetscCheck(flg, PETSC_COMM_WORLD, PETSC_ERR_CONV_FAILED, "Error: MatMulAdd() for MAIJ matrix");

  /* Test MatMultTransposeAdd() */
  PetscCall(MatMultTransposeAddEqual(MA, B, 10, &flg));
  PetscCheck(flg, PETSC_COMM_WORLD, PETSC_ERR_CONV_FAILED, "Error: MatMulTransposeAdd() for MAIJ matrix");

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

/*TEST

   build:
      requires: !complex

   test:
      nsize: {{1 3}}
      requires: datafilespath !complex double !defined(PETSC_USE_64BIT_INDICES)
      args: -f ${DATAFILESPATH}/matrices/arco1 -dof {{1 2 3 4 5 6 8 9 16}} -viewer_binary_skip_info
      output_file: output/empty.out

TEST*/