Actual source code: ex25.c
2: static char help[] = "Tests MatTranspose()\n\n";
4: #include <petscmat.h>
6: int main(int argc, char **args)
7: {
8: Mat C, A;
9: PetscScalar v;
10: PetscInt i, j, m = 4, n = 4, Ii, J, Istart, Iend;
11: PetscMPIInt rank, size;
12: PetscBool equal = PETSC_FALSE;
15: PetscInitialize(&argc, &args, (char *)0, help);
16: MPI_Comm_rank(PETSC_COMM_WORLD, &rank);
17: MPI_Comm_size(PETSC_COMM_WORLD, &size);
19: PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL);
20: n = m;
22: MatCreateAIJ(PETSC_COMM_WORLD, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n, 5, NULL, 5, NULL, &C);
24: /* create the symmetric matrix for the five point stencil */
25: MatGetOwnershipRange(C, &Istart, &Iend);
26: for (Ii = Istart; Ii < Iend; Ii++) {
27: v = -1.0;
28: i = Ii / n;
29: j = Ii - i * n;
30: if (i > 0) {
31: J = Ii - n;
32: MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES);
33: }
34: if (i < m - 1) {
35: J = Ii + n;
36: MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES);
37: }
38: if (j > 0) {
39: J = Ii - 1;
40: MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES);
41: }
42: if (j < n - 1) {
43: J = Ii + 1;
44: MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES);
45: }
46: v = 4.0;
47: MatSetValues(C, 1, &Ii, 1, &Ii, &v, INSERT_VALUES);
48: }
49: MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY);
50: MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY);
52: MatTranspose(C, MAT_INITIAL_MATRIX, &A);
54: MatEqual(C, A, &equal);
57: MatDestroy(&C);
58: MatDestroy(&A);
59: PetscFinalize();
60: return 0;
61: }
63: /*TEST
65: test:
67: TEST*/