static char help[] = "Tests MatMult(), MatMultAdd(), MatMultTranspose().\n\
Also MatMultTransposeAdd(), MatScale(), MatGetDiagonal(), MatDiagonalScale(), MatZeroEntries() and MatDuplicate().\n\n";

#include <petscmat.h>

int main(int argc, char **args)
{
  Mat         C;
  Vec         s, u, w, x, y, z;
  PetscInt    i, j, m = 8, n, rstart, rend, vstart, vend;
  PetscScalar one = 1.0, negone = -1.0, v, alpha = 0.1;
  PetscReal   norm, tol = PETSC_SQRT_MACHINE_EPSILON;
  PetscBool   flg;

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &args, (char *)0, help));
  PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD, PETSC_VIEWER_ASCII_COMMON));
  PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL));
  n = m;
  PetscCall(PetscOptionsHasName(NULL, NULL, "-rectA", &flg));
  if (flg) n += 2;
  PetscCall(PetscOptionsHasName(NULL, NULL, "-rectB", &flg));
  if (flg) n -= 2;

  /* ---------- Assemble matrix and vectors ----------- */

  PetscCall(MatCreate(PETSC_COMM_WORLD, &C));
  PetscCall(MatSetSizes(C, PETSC_DECIDE, PETSC_DECIDE, m, n));
  PetscCall(MatSetFromOptions(C));
  PetscCall(MatSetUp(C));
  PetscCall(MatGetOwnershipRange(C, &rstart, &rend));
  PetscCall(VecCreate(PETSC_COMM_WORLD, &x));
  PetscCall(VecSetSizes(x, PETSC_DECIDE, m));
  PetscCall(VecSetFromOptions(x));
  PetscCall(VecDuplicate(x, &z));
  PetscCall(VecDuplicate(x, &w));
  PetscCall(VecCreate(PETSC_COMM_WORLD, &y));
  PetscCall(VecSetSizes(y, PETSC_DECIDE, n));
  PetscCall(VecSetFromOptions(y));
  PetscCall(VecDuplicate(y, &u));
  PetscCall(VecDuplicate(y, &s));
  PetscCall(VecGetOwnershipRange(y, &vstart, &vend));

  /* Assembly */
  for (i = rstart; i < rend; i++) {
    v = 100 * (i + 1);
    PetscCall(VecSetValues(z, 1, &i, &v, INSERT_VALUES));
    for (j = 0; j < n; j++) {
      v = 10 * (i + 1) + j + 1;
      PetscCall(MatSetValues(C, 1, &i, 1, &j, &v, INSERT_VALUES));
    }
  }

  /* Flush off proc Vec values and do more assembly */
  PetscCall(VecAssemblyBegin(z));
  for (i = vstart; i < vend; i++) {
    v = one * ((PetscReal)i);
    PetscCall(VecSetValues(y, 1, &i, &v, INSERT_VALUES));
    v = 100.0 * i;
    PetscCall(VecSetValues(u, 1, &i, &v, INSERT_VALUES));
  }

  /* Flush off proc Mat values and do more assembly */
  PetscCall(MatAssemblyBegin(C, MAT_FLUSH_ASSEMBLY));
  for (i = rstart; i < rend; i++) {
    for (j = 0; j < n; j++) {
      v = 10 * (i + 1) + j + 1;
      PetscCall(MatSetValues(C, 1, &i, 1, &j, &v, INSERT_VALUES));
    }
  }
  /* Try overlap Coomunication with the next stage XXXSetValues */
  PetscCall(VecAssemblyEnd(z));

  PetscCall(MatAssemblyEnd(C, MAT_FLUSH_ASSEMBLY));
  CHKMEMQ;
  /* The Assembly for the second Stage */
  PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY));
  PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY));
  PetscCall(VecAssemblyBegin(y));
  PetscCall(VecAssemblyEnd(y));
  PetscCall(MatScale(C, alpha));
  PetscCall(VecAssemblyBegin(u));
  PetscCall(VecAssemblyEnd(u));
  PetscCall(PetscPrintf(PETSC_COMM_WORLD, "testing MatMult()\n"));
  CHKMEMQ;
  PetscCall(MatMult(C, y, x));
  CHKMEMQ;
  PetscCall(VecView(x, PETSC_VIEWER_STDOUT_WORLD));
  PetscCall(PetscPrintf(PETSC_COMM_WORLD, "testing MatMultAdd()\n"));
  PetscCall(MatMultAdd(C, y, z, w));
  PetscCall(VecAXPY(x, one, z));
  PetscCall(VecAXPY(x, negone, w));
  PetscCall(VecNorm(x, NORM_2, &norm));
  if (norm > tol) PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Norm of error difference = %g\n", (double)norm));

  /* ------- Test MatMultTranspose(), MatMultTransposeAdd() ------- */

  for (i = rstart; i < rend; i++) {
    v = one * ((PetscReal)i);
    PetscCall(VecSetValues(x, 1, &i, &v, INSERT_VALUES));
  }
  PetscCall(VecAssemblyBegin(x));
  PetscCall(VecAssemblyEnd(x));
  PetscCall(PetscPrintf(PETSC_COMM_WORLD, "testing MatMultTranspose()\n"));
  PetscCall(MatMultTranspose(C, x, y));
  PetscCall(VecView(y, PETSC_VIEWER_STDOUT_WORLD));

  PetscCall(PetscPrintf(PETSC_COMM_WORLD, "testing MatMultTransposeAdd()\n"));
  PetscCall(MatMultTransposeAdd(C, x, u, s));
  PetscCall(VecAXPY(y, one, u));
  PetscCall(VecAXPY(y, negone, s));
  PetscCall(VecNorm(y, NORM_2, &norm));
  if (norm > tol) PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Norm of error difference = %g\n", (double)norm));

  /* -------------------- Test MatGetDiagonal() ------------------ */

  PetscCall(PetscPrintf(PETSC_COMM_WORLD, "testing MatGetDiagonal(), MatDiagonalScale()\n"));
  PetscCall(MatView(C, PETSC_VIEWER_STDOUT_WORLD));
  PetscCall(VecSet(x, one));
  PetscCall(MatGetDiagonal(C, x));
  PetscCall(VecView(x, PETSC_VIEWER_STDOUT_WORLD));
  for (i = vstart; i < vend; i++) {
    v = one * ((PetscReal)(i + 1));
    PetscCall(VecSetValues(y, 1, &i, &v, INSERT_VALUES));
  }

  /* -------------------- Test () MatDiagonalScale ------------------ */
  PetscCall(PetscOptionsHasName(NULL, NULL, "-test_diagonalscale", &flg));
  if (flg) {
    PetscCall(MatDiagonalScale(C, x, y));
    PetscCall(MatView(C, PETSC_VIEWER_STDOUT_WORLD));
  }
  /* -------------------- Test () MatZeroEntries() and MatDuplicate() ------------------ */
  PetscCall(PetscOptionsHasName(NULL, NULL, "-test_zeroentries", &flg));
  if (flg) {
    Mat D;
    PetscCall(MatDuplicate(C, MAT_COPY_VALUES, &D));
    PetscCall(MatZeroEntries(D));
    PetscCall(MatView(D, PETSC_VIEWER_STDOUT_WORLD));
    PetscCall(MatDestroy(&D));
  }
  /* Free data structures */
  PetscCall(VecDestroy(&u));
  PetscCall(VecDestroy(&s));
  PetscCall(VecDestroy(&w));
  PetscCall(VecDestroy(&x));
  PetscCall(VecDestroy(&y));
  PetscCall(VecDestroy(&z));
  PetscCall(MatDestroy(&C));

  PetscCall(PetscFinalize());
  return 0;
}

/*TEST

   test:
      suffix: 11_A
      args: -mat_type seqaij -rectA
      filter: grep -v type

   test:
      args: -mat_type seqdense -rectA
      suffix: 12_A

   test:
      args: -mat_type seqaij -rectB
      suffix: 11_B
      filter: grep -v type

   test:
      args: -mat_type seqdense -rectB
      suffix: 12_B

   test:
      suffix: 21
      args: -mat_type mpiaij
      filter: grep -v type

   test:
      suffix: 22
      args: -mat_type mpidense

   test:
      suffix: 23
      nsize: 3
      args: -mat_type mpiaij
      filter: grep -v type

   test:
      suffix: 24
      nsize: 3
      args: -mat_type mpidense

   test:
      suffix: 2_aijcusparse_1
      args: -mat_type mpiaijcusparse -vec_type cuda
      filter: grep -v type
      output_file: output/ex5_21.out
      requires: cuda

   test:
      nsize: 3
      suffix: 2_aijcusparse_2
      filter: grep -v type
      args: -mat_type mpiaijcusparse -vec_type cuda
      args: -sf_type {{basic neighbor}}
      output_file: output/ex5_23.out
      requires: cuda

   test:
      nsize: 3
      suffix: 2_aijcusparse_3
      filter: grep -v type
      args: -mat_type mpiaijcusparse -vec_type cuda
      args: -sf_type {{basic neighbor}}
      output_file: output/ex5_23.out
      requires: cuda defined(PETSC_HAVE_MPI_GPU_AWARE)

   test:
      suffix: 31
      args: -mat_type mpiaij -test_diagonalscale
      filter: grep -v type

   test:
      suffix: 32
      args: -mat_type mpibaij -test_diagonalscale

   test:
      suffix: 33
      nsize: 3
      args: -mat_type mpiaij -test_diagonalscale
      filter: grep -v type

   test:
      suffix: 34
      nsize: 3
      args: -mat_type mpibaij -test_diagonalscale

   test:
      suffix: 3_aijcusparse_1
      args: -mat_type mpiaijcusparse -vec_type cuda -test_diagonalscale
      filter: grep -v type
      output_file: output/ex5_31.out
      requires: cuda

   test:
      suffix: 3_aijcusparse_2
      nsize: 3
      args: -mat_type mpiaijcusparse -vec_type cuda -test_diagonalscale
      filter: grep -v type
      output_file: output/ex5_33.out
      requires: cuda

   test:
      suffix: 3_kokkos
      nsize: 3
      args: -mat_type mpiaijkokkos -vec_type kokkos -test_diagonalscale
      filter: grep -v type
      output_file: output/ex5_33.out
      requires: kokkos_kernels

   test:
      suffix: aijcusparse_1
      args: -mat_type seqaijcusparse -vec_type cuda -rectA
      filter: grep -v type
      output_file: output/ex5_11_A.out
      requires: cuda

   test:
      suffix: aijcusparse_2
      args: -mat_type seqaijcusparse -vec_type cuda -rectB
      filter: grep -v type
      output_file: output/ex5_11_B.out
      requires: cuda

   test:
      suffix: sell_1
      args: -mat_type sell -mat_sell_slice_height 8
      output_file: output/ex5_41.out

   test:
      suffix: sell_2
      nsize: 3
      args: -mat_type sell -mat_sell_slice_height 8
      output_file: output/ex5_43.out

   test:
      suffix: sell_3
      args: -mat_type sell -test_diagonalscale -mat_sell_slice_height 8
      output_file: output/ex5_51.out

   test:
      suffix: sell_4
      nsize: 3
      args: -mat_type sell -test_diagonalscale -mat_sell_slice_height 8
      output_file: output/ex5_53.out

   test:
      suffix: sell_5
      nsize: 3
      args: -mat_type sellcuda -vec_type cuda -test_diagonalscale -test_zeroentries
      output_file: output/ex5_55.out
      requires: cuda !complex

   test:
      suffix: sell_6
      nsize: 3
      args: -mat_type sellcuda -vec_type cuda -mat_sell_spmv_cuda_kernel {{1 2 3 4 5 6}}
      output_file: output/ex5_56.out
      requires: cuda !complex

   test:
      suffix: sell_7
      args: -m 32 -mat_type sellcuda -vec_type cuda -mat_sell_spmv_cuda_kernel {{0 7 9}} -mat_sell_spmv_cuda_blocky {{2 4 8 16 32}}
      output_file: output/ex5_57.out
      requires: cuda !complex !single
TEST*/
