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*/