static char help[] = "Test MatSetValuesCOO for MPIAIJ and its subclasses \n\n";

#include <petscmat.h>
int main(int argc, char **args) {
  Mat            A, B;
  PetscInt       k;
  const PetscInt M = 18, N = 18;
  PetscMPIInt    rank, size;
  PetscBool      equal;
  PetscScalar   *vals;
  PetscBool      flg = PETSC_FALSE;

  /* Construct 18 x 18 matrices, which are big enough to have complex communication patterns but still small enough for debugging */
  PetscInt i0[] = {7, 7, 8, 8, 9, 16, 17, 9, 10, 1, 1, -2, 2, 3, 3, 14, 4, 5, 10, 13, 9, 9, 10, 1, 0, 0, 5, 5, 6, 6, 13, 13, 14, -14, 4, 4, 5, 11, 11, 12, 15, 15, 16};
  PetscInt j0[] = {1, 6, 2, 4, 10, 15, 13, 16, 11, 2, 7, 3, 8, 4, 9, 13, 5, 2, 15, 14, 10, 16, 11, 2, 0, 1, 5, -11, 0, 7, 15, 17, 11, 13, 4, 8, 2, 12, 17, 13, 3, 16, 9};

  PetscInt i1[] = {8, 5, 15, 16, 6, 13, 4, 17, 8, 9, 9, 10, -6, 12, 7, 3, -4, 1, 1, 2, 5, 5, 6, 14, 17, 8, 9, 9, 10, 4, 5, 10, 11, 1, 2};
  PetscInt j1[] = {2, 3, 16, 9, 5, 17, 1, 13, 4, 10, 16, 11, -5, 12, 1, 7, -1, 2, 7, 3, 6, 11, 0, 11, 13, 4, 10, 16, 11, 8, -2, 15, 12, 7, 3};

  PetscInt i2[] = {3, 4, 1, 10, 0, 1, 1, 2, 1, 1, 2, 2, 3, 3, 4, 4, 1, 2, 5, 5, 6, 4, 17, 0, 1, 1, 8, 5, 5, 6, 4, 7, 8, 5};
  PetscInt j2[] = {7, 1, 2, 11, 5, 2, 7, 3, 2, 7, 3, 8, 4, 9, 3, 5, 7, 3, 6, 11, 0, 1, 13, 5, 2, 7, 4, 6, 11, 0, 1, 3, 4, 2};

  struct {
    PetscInt *i, *j, n;
  } coo[3] = {
    {i0, j0, sizeof(i0) / sizeof(PetscInt)},
    {i1, j1, sizeof(i1) / sizeof(PetscInt)},
    {i2, j2, sizeof(i2) / sizeof(PetscInt)}
  };

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &args, (char *)0, help));
  PetscCall(PetscOptionsGetBool(NULL, NULL, "-ignore_remote", &flg, NULL));
  PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
  PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));

  PetscCheck(size <= 3, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, "This test requires at most 3 processes");

  PetscCall(MatCreate(PETSC_COMM_WORLD, &A));
  PetscCall(MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, M, N));
  PetscCall(MatSetType(A, MATAIJ));
  PetscCall(MatSeqAIJSetPreallocation(A, 2, NULL));
  PetscCall(MatMPIAIJSetPreallocation(A, 2, NULL, 2, NULL));
  PetscCall(MatSetOption(A, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_FALSE));
  PetscCall(MatSetOption(A, MAT_IGNORE_OFF_PROC_ENTRIES, flg));

  PetscCall(PetscMalloc1(coo[rank].n, &vals));
  for (k = 0; k < coo[rank].n; k++) {
    vals[k] = coo[rank].j[k];
    PetscCall(MatSetValue(A, coo[rank].i[k], coo[rank].j[k], vals[k], ADD_VALUES));
  }
  PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
  PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));

  PetscCall(MatCreate(PETSC_COMM_WORLD, &B));
  PetscCall(MatSetSizes(B, PETSC_DECIDE, PETSC_DECIDE, M, N));
  PetscCall(MatSetFromOptions(B));
  PetscCall(MatSetOption(B, MAT_IGNORE_OFF_PROC_ENTRIES, flg));
  PetscCall(MatSetPreallocationCOO(B, coo[rank].n, coo[rank].i, coo[rank].j));

  PetscCall(MatSetValuesCOO(B, vals, ADD_VALUES));
  PetscCall(MatEqual(A, B, &equal));

  if (!equal) {
    PetscCall(MatView(A, PETSC_VIEWER_STDOUT_WORLD));
    PetscCall(MatView(B, PETSC_VIEWER_STDOUT_WORLD));
    SETERRQ(PETSC_COMM_WORLD, PETSC_ERR_PLIB, "MatSetValuesCOO() failed");
  }

  PetscCall(PetscFree(vals));
  PetscCall(MatDestroy(&A));
  PetscCall(MatDestroy(&B));

  PetscCall(PetscFinalize());
  return 0;
}

/*TEST

  testset:
    output_file: output/ex254_1.out
    nsize: {{1 2 3}}
    args: -ignore_remote {{0 1}}

    test:
      suffix: kokkos
      requires: kokkos_kernels
      args: -mat_type aijkokkos

    test:
      suffix: cuda
      requires: cuda
      args: -mat_type aijcusparse

    test:
      suffix: aij
      args: -mat_type aij

  testset:
    # MATHYPRE does not support MAT_IGNORE_OFF_PROC_ENTRIES yet
    output_file: output/ex254_1.out
    nsize: {{1 2 3}}
    suffix: hypre
    requires: hypre kokkos_kernels
    args: -ignore_remote 0 -mat_type hypre

TEST*/