Actual source code: ex25.c
1: static char help[] = "Tests MatTranspose()\n\n";
3: #include <petscmat.h>
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;
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));
18: PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL));
19: n = m;
21: PetscCall(MatCreateAIJ(PETSC_COMM_WORLD, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n, 5, NULL, 5, NULL, &C));
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));
51: PetscCall(MatTranspose(C, MAT_INITIAL_MATRIX, &A));
53: PetscCall(MatEqual(C, A, &equal));
54: PetscCheck(equal, PETSC_COMM_SELF, PETSC_ERR_SUP, "C != C^T");
56: PetscCall(MatDestroy(&C));
57: PetscCall(MatDestroy(&A));
58: PetscCall(PetscFinalize());
59: return 0;
60: }
62: /*TEST
64: test:
66: TEST*/