static char help[] = "Tests the various routines in MatBAIJ format.\n\
Input arguments are:\n\
  -f <input_file> : file to load.  For example see $PETSC_DIR/share/petsc/datafiles/matrices\n\n";

#include <petscmat.h>

int main(int argc, char **args)
{
  Mat                A, B, C;
  PetscViewer        va, vb, vc;
  Vec                x, y;
  PetscInt           i, j, row, m, n, ncols1, ncols2, ct, m2, n2;
  const PetscInt    *cols1, *cols2;
  char               file[PETSC_MAX_PATH_LEN];
  PetscBool          tflg;
  PetscScalar        rval;
  const PetscScalar *vals1, *vals2;
  PetscReal          norm1, norm2, rnorm;
  PetscRandom        r;

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &args, NULL, help));
  PetscCall(PetscOptionsGetString(NULL, NULL, "-f", file, sizeof(file), NULL));

  /* Load the matrix as AIJ format */
  PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, file, FILE_MODE_READ, &va));
  PetscCall(MatCreate(PETSC_COMM_WORLD, &A));
  PetscCall(MatSetType(A, MATSEQAIJ));
  PetscCall(MatLoad(A, va));
  PetscCall(PetscViewerDestroy(&va));

  /* Load the matrix as BAIJ format */
  PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, file, FILE_MODE_READ, &vb));
  PetscCall(MatCreate(PETSC_COMM_WORLD, &B));
  PetscCall(MatSetType(B, MATSEQBAIJ));
  PetscCall(MatLoad(B, vb));
  PetscCall(PetscViewerDestroy(&vb));

  /* Load the matrix as BAIJ format */
  PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, file, FILE_MODE_READ, &vc));
  PetscCall(MatCreate(PETSC_COMM_WORLD, &C));
  PetscCall(MatSetType(C, MATSEQBAIJ));
  PetscCall(MatSetFromOptions(C));
  PetscCall(MatLoad(C, vc));
  PetscCall(PetscViewerDestroy(&vc));

  PetscCall(MatGetSize(A, &m, &n));
  PetscCall(MatGetSize(B, &m2, &n2));
  PetscCheck(m == m2, PETSC_COMM_SELF, PETSC_ERR_ARG_SIZ, "Matrices are of different size. Cannot run this example");

  /* Test MatEqual() */
  PetscCall(MatEqual(B, C, &tflg));
  PetscCheck(tflg, PETSC_COMM_SELF, PETSC_ERR_PLIB, "MatEqual() failed");

  /* Test MatGetDiagonal() */
  PetscCall(VecCreateSeq(PETSC_COMM_SELF, m, &x));
  PetscCall(VecCreateSeq(PETSC_COMM_SELF, m, &y));

  PetscCall(MatGetDiagonal(A, x));
  PetscCall(MatGetDiagonal(B, y));

  PetscCall(VecEqual(x, y, &tflg));
  PetscCheck(tflg, PETSC_COMM_SELF, PETSC_ERR_PLIB, "MatGetDiagonal() failed");

  /* Test MatDiagonalScale() */
  PetscCall(PetscRandomCreate(PETSC_COMM_SELF, &r));
  PetscCall(PetscRandomSetFromOptions(r));
  PetscCall(VecSetRandom(x, r));
  PetscCall(VecSetRandom(y, r));

  PetscCall(MatDiagonalScale(A, x, y));
  PetscCall(MatDiagonalScale(B, x, y));
  PetscCall(MatMult(A, x, y));
  PetscCall(VecNorm(y, NORM_2, &norm1));
  PetscCall(MatMult(B, x, y));
  PetscCall(VecNorm(y, NORM_2, &norm2));
  rnorm = ((norm1 - norm2) * 100) / norm1;
  PetscCheck(rnorm >= -0.1 && rnorm <= 0.01, PETSC_COMM_SELF, PETSC_ERR_PLIB, "MatDiagonalScale() failed Norm1 %g Norm2 %g", (double)norm1, (double)norm2);

  /* Test MatGetRow()/ MatRestoreRow() */
  for (ct = 0; ct < 100; ct++) {
    PetscCall(PetscRandomGetValue(r, &rval));
    row = (int)(rval * m);
    PetscCall(MatGetRow(A, row, &ncols1, &cols1, &vals1));
    PetscCall(MatGetRow(B, row, &ncols2, &cols2, &vals2));

    for (i = 0, j = 0; i < ncols1 && j < ncols2; i++) {
      while (cols2[j] != cols1[i]) j++;
      PetscCheck(vals1[i] == vals2[j], PETSC_COMM_SELF, PETSC_ERR_PLIB, "MatGetRow() failed - vals incorrect.");
    }
    PetscCheck(i >= ncols1, PETSC_COMM_SELF, PETSC_ERR_PLIB, "MatGetRow() failed - cols incorrect");

    PetscCall(MatRestoreRow(A, row, &ncols1, &cols1, &vals1));
    PetscCall(MatRestoreRow(B, row, &ncols2, &cols2, &vals2));
  }

  PetscCall(MatDestroy(&A));
  PetscCall(MatDestroy(&B));
  PetscCall(MatDestroy(&C));
  PetscCall(VecDestroy(&x));
  PetscCall(VecDestroy(&y));
  PetscCall(PetscRandomDestroy(&r));
  PetscCall(PetscFinalize());
  return 0;
}

/*TEST

   build:
      requires: !complex

   test:
      args: -f ${DATAFILESPATH}/matrices/cfd.1.10 -mat_block_size 5
      requires: !complex double datafilespath !defined(PETSC_USE_64BIT_INDICES)
      output_file: output/empty.out

TEST*/