Actual source code: ex101.c

  1: static char help[] = "Testing PtAP for SeqMAIJ matrix, P, with SeqAIJ matrix, A.\n\n";

  3: #include <petscmat.h>

  5: int main(int argc, char **argv)
  6: {
  7:   Mat         pA, P, aijP;
  8:   PetscScalar pa[] = {1., -1., 0., 0., 1., -1., 0., 0., 1.};
  9:   PetscInt    i, pij[] = {0, 1, 2};
 10:   PetscInt    aij[3][3] = {
 11:     {0, 1, 2},
 12:     {3, 4, 5},
 13:     {6, 7, 8}
 14:   };
 15:   Mat         A, mC, C;
 16:   PetscScalar one = 1.;
 17:   PetscMPIInt size;
 18:   PetscBool   flg;

 20:   PetscFunctionBeginUser;
 21:   PetscCall(PetscInitialize(&argc, &argv, (char *)0, help));
 22:   PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
 23:   PetscCheck(size == 1, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, "This is a uniprocessor example only!");

 25:   /* Create MAIJ matrix, P */
 26:   PetscCall(MatCreate(PETSC_COMM_SELF, &pA));
 27:   PetscCall(MatSetSizes(pA, 3, 3, 3, 3));
 28:   PetscCall(MatSetType(pA, MATSEQAIJ));
 29:   PetscCall(MatSetUp(pA));
 30:   PetscCall(MatSetOption(pA, MAT_IGNORE_ZERO_ENTRIES, PETSC_TRUE));
 31:   PetscCall(MatSetValues(pA, 3, pij, 3, pij, pa, ADD_VALUES));
 32:   PetscCall(MatAssemblyBegin(pA, MAT_FINAL_ASSEMBLY));
 33:   PetscCall(MatAssemblyEnd(pA, MAT_FINAL_ASSEMBLY));
 34:   PetscCall(MatCreateMAIJ(pA, 3, &P));
 35:   PetscCall(MatDestroy(&pA));

 37:   /* Create AIJ equivalent matrix, aijP, for comparison testing */
 38:   PetscCall(MatConvert(P, MATSEQAIJ, MAT_INITIAL_MATRIX, &aijP));

 40:   /* Create AIJ matrix A */
 41:   PetscCall(MatCreate(PETSC_COMM_SELF, &A));
 42:   PetscCall(MatSetSizes(A, 9, 9, 9, 9));
 43:   PetscCall(MatSetType(A, MATSEQAIJ));
 44:   PetscCall(MatSetUp(A));
 45:   PetscCall(MatSetOption(A, MAT_IGNORE_ZERO_ENTRIES, PETSC_TRUE));
 46:   PetscCall(MatSetValues(A, 3, aij[0], 3, aij[0], pa, ADD_VALUES));
 47:   PetscCall(MatSetValues(A, 3, aij[1], 3, aij[1], pa, ADD_VALUES));
 48:   PetscCall(MatSetValues(A, 3, aij[2], 3, aij[2], pa, ADD_VALUES));
 49:   for (i = 0; i < 9; i++) PetscCall(MatSetValue(A, i, i, one, ADD_VALUES));
 50:   PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
 51:   PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));

 53:   /* Perform PtAP_SeqAIJ_SeqAIJ for comparison testing */
 54:   PetscCall(MatPtAP(A, aijP, MAT_INITIAL_MATRIX, 1., &C));

 56:   /* Perform PtAP_SeqAIJ_SeqMAIJ */
 57:   /* Developer API */
 58:   PetscCall(MatProductCreate(A, P, NULL, &mC));
 59:   PetscCall(MatProductSetType(mC, MATPRODUCT_PtAP));
 60:   PetscCall(MatProductSetAlgorithm(mC, "default"));
 61:   PetscCall(MatProductSetFill(mC, PETSC_DEFAULT));
 62:   PetscCall(MatProductSetFromOptions(mC));
 63:   PetscCall(MatProductSymbolic(mC));
 64:   PetscCall(MatProductNumeric(mC));
 65:   PetscCall(MatProductNumeric(mC));

 67:   /* Check mC = C */
 68:   PetscCall(MatEqual(C, mC, &flg));
 69:   PetscCheck(flg, PETSC_COMM_SELF, PETSC_ERR_ARG_INCOMP, "MatProduct C != mC");
 70:   PetscCall(MatDestroy(&mC));

 72:   /* User API */
 73:   PetscCall(MatPtAP(A, P, MAT_INITIAL_MATRIX, 1., &mC));
 74:   PetscCall(MatPtAP(A, P, MAT_REUSE_MATRIX, 1., &mC));

 76:   /* Check mC = C */
 77:   PetscCall(MatEqual(C, mC, &flg));
 78:   PetscCheck(flg, PETSC_COMM_SELF, PETSC_ERR_ARG_INCOMP, "MatPtAP C != mC");
 79:   PetscCall(MatDestroy(&mC));

 81:   /* Cleanup */
 82:   PetscCall(MatDestroy(&P));
 83:   PetscCall(MatDestroy(&aijP));
 84:   PetscCall(MatDestroy(&A));
 85:   PetscCall(MatDestroy(&C));
 86:   PetscCall(PetscFinalize());
 87:   return 0;
 88: }

 90: /*TEST

 92:    test:
 93:       output_file: output/ex101.out

 95: TEST*/