Actual source code: ex209.c
1: static char help[] = "Test MatTransposeMatMult() \n\n";
3: /* Example:
4: mpiexec -n 8 ./ex209 -f <inputfile> (e.g., inputfile=ceres_solver_iteration_001_A.petsc)
5: */
7: #include <petscmat.h>
9: int main(int argc, char **args)
10: {
11: Mat A, C, AtA, B;
12: PetscViewer fd;
13: char file[PETSC_MAX_PATH_LEN];
14: PetscReal fill = 4.0;
15: PetscMPIInt rank, size;
16: PetscBool equal;
17: PetscInt i, m, n, rstart, rend;
18: PetscScalar one = 1.0;
20: PetscFunctionBeginUser;
21: PetscCall(PetscInitialize(&argc, &args, NULL, help));
22: PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
23: PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
24: PetscCall(PetscOptionsGetString(NULL, NULL, "-f", file, sizeof(file), NULL));
26: /* Load matrix A */
27: PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, file, FILE_MODE_READ, &fd));
28: PetscCall(MatCreate(PETSC_COMM_WORLD, &A));
29: PetscCall(MatSetType(A, MATAIJ));
30: PetscCall(MatLoad(A, fd));
31: PetscCall(PetscViewerDestroy(&fd));
33: /* Create identity matrix B */
34: PetscCall(MatGetLocalSize(A, &m, &n));
35: PetscCall(MatCreate(PETSC_COMM_WORLD, &B));
36: PetscCall(MatSetSizes(B, m, m, PETSC_DECIDE, PETSC_DECIDE));
37: PetscCall(MatSetType(B, MATAIJ));
38: PetscCall(MatSetFromOptions(B));
39: PetscCall(MatSetUp(B));
41: PetscCall(MatGetOwnershipRange(B, &rstart, &rend));
42: for (i = rstart; i < rend; i++) PetscCall(MatSetValues(B, 1, &i, 1, &i, &one, INSERT_VALUES));
43: PetscCall(MatAssemblyBegin(B, MAT_FINAL_ASSEMBLY));
44: PetscCall(MatAssemblyEnd(B, MAT_FINAL_ASSEMBLY));
46: /* Compute AtA = A^T*B*A, B = identity matrix */
47: PetscCall(MatPtAP(B, A, MAT_INITIAL_MATRIX, fill, &AtA));
48: PetscCall(MatPtAP(B, A, MAT_REUSE_MATRIX, fill, &AtA));
49: if (rank == 0) printf("C = A^T*B*A is done...\n");
50: PetscCall(MatDestroy(&B));
52: /* Compute C = A^T*A */
53: PetscCall(MatTransposeMatMult(A, A, MAT_INITIAL_MATRIX, fill, &C));
54: if (rank == 0) printf("C = A^T*A is done...\n");
55: PetscCall(MatTransposeMatMult(A, A, MAT_REUSE_MATRIX, fill, &C));
56: if (rank == 0) printf("REUSE C = A^T*A is done...\n");
58: /* Compare C and AtA */
59: PetscCall(MatMultEqual(C, AtA, 20, &equal));
60: PetscCheck(equal, PETSC_COMM_SELF, PETSC_ERR_ARG_WRONGSTATE, "A^T*A != At*A");
61: PetscCall(MatDestroy(&AtA));
63: PetscCall(MatDestroy(&C));
64: PetscCall(MatDestroy(&A));
65: PetscCall(PetscFinalize());
66: return 0;
67: }
69: /*TEST
71: test:
72: requires: datafilespath !complex double !defined(PETSC_USE_64BIT_INDICES)
73: args: -f ${DATAFILESPATH}/matrices/arco1
75: test:
76: suffix: 2
77: nsize: 4
78: requires: datafilespath !complex double !defined(PETSC_USE_64BIT_INDICES)
79: args: -f ${DATAFILESPATH}/matrices/arco1 -matptap_via nonscalable
81: TEST*/