static char help[] = "Test MatAXPY()\n\n";

#include <petscmat.h>

int main(int argc, char **args)
{
  Mat         C, C1, C2, CU;
  PetscScalar v;
  PetscInt    Ii, J, Istart, Iend;
  PetscInt    i, j, m = 3, n;
  PetscMPIInt size;
  PetscBool   mat_nonsymmetric = PETSC_FALSE, flg;
  MatInfo     info;

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &args, (char *)0, help));
  PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL));
  PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
  n = 2 * size;

  /* Set flag if we are doing a nonsymmetric problem; the default is symmetric. */
  PetscCall(PetscOptionsGetBool(NULL, NULL, "-mat_nonsym", &mat_nonsymmetric, NULL));

  PetscCall(MatCreate(PETSC_COMM_WORLD, &C));
  PetscCall(MatSetSizes(C, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n));
  PetscCall(MatSetFromOptions(C));
  PetscCall(MatSeqAIJSetPreallocation(C, 5, NULL));
  PetscCall(MatMPIAIJSetPreallocation(C, 5, NULL, 5, NULL));

  PetscCall(MatGetOwnershipRange(C, &Istart, &Iend));
  for (Ii = Istart; Ii < Iend; Ii++) {
    v = -1.0;
    i = Ii / n;
    j = Ii - i * n;
    if (i > 0) {
      J = Ii - n;
      PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, ADD_VALUES));
    }
    if (i < m - 1) {
      J = Ii + n;
      PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, ADD_VALUES));
    }
    if (j > 0) {
      J = Ii - 1;
      PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, ADD_VALUES));
    }
    if (j < n - 1) {
      J = Ii + 1;
      PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, ADD_VALUES));
    }
    v = 4.0;
    PetscCall(MatSetValues(C, 1, &Ii, 1, &Ii, &v, ADD_VALUES));
  }

  /* Make the matrix nonsymmetric if desired */
  if (mat_nonsymmetric) {
    for (Ii = Istart; Ii < Iend; Ii++) {
      v = -1.5;
      i = Ii / n;
      if (i > 1) {
        J = Ii - n - 1;
        PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, ADD_VALUES));
      }
    }
  } else {
    PetscCall(MatSetOption(C, MAT_SYMMETRIC, PETSC_TRUE));
    PetscCall(MatSetOption(C, MAT_SYMMETRY_ETERNAL, PETSC_TRUE));
  }
  PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY));
  PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY));
  PetscCall(PetscObjectSetName((PetscObject)C, "C"));
  PetscCall(MatViewFromOptions(C, NULL, "-view"));

  /* C1 = 2.0*C1 + C, C1 is anti-diagonal and has different non-zeros than C */
  PetscCall(MatCreate(PETSC_COMM_WORLD, &C1));
  PetscCall(MatSetSizes(C1, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n));
  PetscCall(MatSetFromOptions(C1));
  PetscCall(MatSeqAIJSetPreallocation(C1, 1, NULL));
  PetscCall(MatMPIAIJSetPreallocation(C1, 1, NULL, 1, NULL));
  for (Ii = Istart; Ii < Iend; Ii++) {
    v = 1.0;
    i = m * n - Ii - 1;
    j = Ii;
    PetscCall(MatSetValues(C1, 1, &i, 1, &j, &v, ADD_VALUES));
  }
  PetscCall(MatAssemblyBegin(C1, MAT_FINAL_ASSEMBLY));
  PetscCall(MatAssemblyEnd(C1, MAT_FINAL_ASSEMBLY));
  PetscCall(PetscObjectSetName((PetscObject)C1, "C1"));
  PetscCall(MatViewFromOptions(C1, NULL, "-view"));
  PetscCall(MatDuplicate(C1, MAT_COPY_VALUES, &CU));

  PetscCall(PetscPrintf(PETSC_COMM_WORLD, " MatAXPY(C1,2.0,C,DIFFERENT_NONZERO_PATTERN)...\n"));
  PetscCall(MatAXPY(C1, 2.0, C, DIFFERENT_NONZERO_PATTERN));
  PetscCall(MatAXPY(CU, 2.0, C, UNKNOWN_NONZERO_PATTERN));
  PetscCall(MatGetInfo(C1, MAT_GLOBAL_SUM, &info));
  PetscCall(PetscPrintf(PETSC_COMM_WORLD, " C1: nz_allocated = %g; nz_used = %g; nz_unneeded = %g\n", info.nz_allocated, info.nz_used, info.nz_unneeded));
  PetscCall(MatViewFromOptions(C1, NULL, "-view"));
  PetscCall(MatMultEqual(CU, C1, 10, &flg));
  if (!flg) {
    PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Error UNKNOWN_NONZERO_PATTERN (supposedly DIFFERENT_NONZERO_PATTERN)\n"));
    PetscCall(MatViewFromOptions(CU, NULL, "-view"));
  }
  PetscCall(MatDestroy(&CU));

  /* Secondly, compute C1 = 2.0*C2 + C1, C2 has non-zero pattern of C */
  PetscCall(MatDuplicate(C, MAT_DO_NOT_COPY_VALUES, &C2));
  PetscCall(MatDuplicate(C1, MAT_COPY_VALUES, &CU));

  for (Ii = Istart; Ii < Iend; Ii++) {
    v = 1.0;
    PetscCall(MatSetValues(C2, 1, &Ii, 1, &Ii, &v, ADD_VALUES));
  }
  PetscCall(MatAssemblyBegin(C2, MAT_FINAL_ASSEMBLY));
  PetscCall(MatAssemblyEnd(C2, MAT_FINAL_ASSEMBLY));
  PetscCall(PetscObjectSetName((PetscObject)C2, "C2"));
  PetscCall(MatViewFromOptions(C2, NULL, "-view"));
  PetscCall(PetscPrintf(PETSC_COMM_WORLD, " MatAXPY(C1,2.0,C2,SUBSET_NONZERO_PATTERN)...\n"));
  PetscCall(MatAXPY(C1, 2.0, C2, SUBSET_NONZERO_PATTERN));
  PetscCall(MatAXPY(CU, 2.0, C2, UNKNOWN_NONZERO_PATTERN));
  PetscCall(MatGetInfo(C1, MAT_GLOBAL_SUM, &info));
  PetscCall(PetscPrintf(PETSC_COMM_WORLD, " C1: nz_allocated = %g; nz_used = %g; nz_unneeded = %g\n", info.nz_allocated, info.nz_used, info.nz_unneeded));
  PetscCall(MatViewFromOptions(C1, NULL, "-view"));
  PetscCall(MatMultEqual(CU, C1, 10, &flg));
  if (!flg) {
    PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Error UNKNOWN_NONZERO_PATTERN (supposedly SUBSET_NONZERO_PATTERN)\n"));
    PetscCall(MatViewFromOptions(CU, NULL, "-view"));
  }
  PetscCall(MatDestroy(&CU));

  /* Test SAME_NONZERO_PATTERN computing C2 = C2 + 2.0 * C */
  PetscCall(MatDuplicate(C2, MAT_COPY_VALUES, &CU));
  PetscCall(PetscPrintf(PETSC_COMM_WORLD, " MatAXPY(C2,2.0,C,SAME_NONZERO_PATTERN)...\n"));
  PetscCall(MatAXPY(C2, 2.0, C, SAME_NONZERO_PATTERN));
  PetscCall(MatAXPY(CU, 2.0, C, UNKNOWN_NONZERO_PATTERN));
  PetscCall(MatGetInfo(C2, MAT_GLOBAL_SUM, &info));
  PetscCall(PetscPrintf(PETSC_COMM_WORLD, " C2: nz_allocated = %g; nz_used = %g; nz_unneeded = %g\n", info.nz_allocated, info.nz_used, info.nz_unneeded));
  PetscCall(MatViewFromOptions(C2, NULL, "-view"));
  PetscCall(MatMultEqual(CU, C2, 10, &flg));
  if (!flg) {
    PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Error UNKNOWN_NONZERO_PATTERN (supposedly SUBSET_NONZERO_PATTERN)\n"));
    PetscCall(MatViewFromOptions(CU, NULL, "-view"));
  }
  PetscCall(MatDestroy(&CU));

  PetscCall(MatDestroy(&C1));
  PetscCall(MatDestroy(&C2));
  PetscCall(MatDestroy(&C));

  PetscCall(PetscFinalize());
  return 0;
}

/*TEST

   test:
     suffix: 1
     filter: grep -v " type:" | grep -v "Mat Object"
     args: -view
     diff_args: -j

   test:
     output_file: output/ex132_1.out
     requires: cuda
     suffix: 1_cuda
     filter: grep -v " type:" | grep -v "Mat Object"
     args: -view -mat_type aijcusparse
     diff_args: -j

   test:
     output_file: output/ex132_1.out
     requires: kokkos_kernels
     suffix: 1_kokkos
     filter: grep -v " type:" | grep -v "Mat Object"
     args: -view -mat_type aijkokkos
     diff_args: -j

   test:
     suffix: 2
     filter: grep -v " type:" | grep -v "Mat Object"
     args: -view -mat_nonsym
     diff_args: -j

   test:
     output_file: output/ex132_2.out
     requires: cuda
     suffix: 2_cuda
     filter: grep -v " type:" | grep -v "Mat Object"
     args: -view -mat_type aijcusparse -mat_nonsym
     diff_args: -j

   test:
     output_file: output/ex132_2.out
     requires: kokkos_kernels
     suffix: 2_kokkos
     filter: grep -v " type:" | grep -v "Mat Object"
     args: -view -mat_type aijkokkos -mat_nonsym
     diff_args: -j

   test:
     nsize: 2
     suffix: 1_par
     filter: grep -v " type:" | grep -v "Mat Object"
     args: -view
     diff_args: -j

   test:
     nsize: 2
     output_file: output/ex132_1_par.out
     requires: cuda
     suffix: 1_par_cuda
     filter: grep -v " type:" | grep -v "Mat Object"
     args: -view -mat_type aijcusparse
     diff_args: -j

   test:
     nsize: 2
     output_file: output/ex132_1_par.out
     requires: kokkos_kernels
     suffix: 1_par_kokkos
     filter: grep -v " type:" | grep -v "Mat Object"
     args: -view -mat_type aijkokkos
     diff_args: -j

   test:
     nsize: 2
     suffix: 2_par
     filter: grep -v " type:" | grep -v "Mat Object"
     args: -view -mat_nonsym
     diff_args: -j

   test:
     nsize: 2
     output_file: output/ex132_2_par.out
     requires: cuda
     suffix: 2_par_cuda
     filter: grep -v " type:" | grep -v "Mat Object"
     args: -view -mat_type aijcusparse -mat_nonsym
     diff_args: -j

   testset:
     nsize: 2
     output_file: output/ex132_2_par.out
     requires: kokkos_kernels
     filter: grep -v " type:" | grep -v "Mat Object"
     args: -view -mat_type aijkokkos -mat_nonsym
     diff_args: -j
     test:
       suffix: 2_par_kokkos_no_gpu_aware
       args: -use_gpu_aware_mpi 0
     test:
       requires: defined(HAVE_MPI_GPU_AWARE)
       suffix: 2_par_kokkos_gpu_aware
       args: -use_gpu_aware_mpi 1

TEST*/
