1 static char help[] = "Tests MatTranspose()\n\n";
2
3 #include <petscmat.h>
4
main(int argc,char ** args)5 int main(int argc, char **args)
6 {
7 Mat C, A;
8 PetscScalar v;
9 PetscInt i, j, m = 4, n = 4, Ii, J, Istart, Iend;
10 PetscMPIInt rank, size;
11 PetscBool equal = PETSC_FALSE;
12
13 PetscFunctionBeginUser;
14 PetscCall(PetscInitialize(&argc, &args, NULL, help));
15 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
16 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
17
18 PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL));
19 n = m;
20
21 PetscCall(MatCreateAIJ(PETSC_COMM_WORLD, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n, 5, NULL, 5, NULL, &C));
22
23 /* create the symmetric matrix for the five point stencil */
24 PetscCall(MatGetOwnershipRange(C, &Istart, &Iend));
25 for (Ii = Istart; Ii < Iend; Ii++) {
26 v = -1.0;
27 i = Ii / n;
28 j = Ii - i * n;
29 if (i > 0) {
30 J = Ii - n;
31 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES));
32 }
33 if (i < m - 1) {
34 J = Ii + n;
35 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES));
36 }
37 if (j > 0) {
38 J = Ii - 1;
39 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES));
40 }
41 if (j < n - 1) {
42 J = Ii + 1;
43 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES));
44 }
45 v = 4.0;
46 PetscCall(MatSetValues(C, 1, &Ii, 1, &Ii, &v, INSERT_VALUES));
47 }
48 PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY));
49 PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY));
50
51 PetscCall(MatTranspose(C, MAT_INITIAL_MATRIX, &A));
52
53 PetscCall(MatEqual(C, A, &equal));
54 PetscCheck(equal, PETSC_COMM_SELF, PETSC_ERR_SUP, "C != C^T");
55
56 PetscCall(MatDestroy(&C));
57 PetscCall(MatDestroy(&A));
58 PetscCall(PetscFinalize());
59 return 0;
60 }
61
62 /*TEST
63
64 test:
65 output_file: output/empty.out
66
67 TEST*/
68