Actual source code: ex71.c
1: static char help[] = "Passes a sparse matrix to MATLAB.\n\n";
3: #include <petscmat.h>
5: int main(int argc, char **args)
6: {
7: PetscInt m = 4, n = 5, i, j, II, J;
8: PetscScalar one = 1.0, v;
9: Vec x;
10: Mat A;
12: PetscFunctionBeginUser;
13: PetscCall(PetscInitialize(&argc, &args, (char *)0, help));
14: PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL));
15: PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL));
17: PetscCall(MatCreate(PETSC_COMM_WORLD, &A));
18: PetscCall(MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n));
19: PetscCall(MatSetFromOptions(A));
20: PetscCall(MatSetUp(A));
22: for (i = 0; i < m; i++) {
23: for (j = 0; j < n; j++) {
24: v = -1.0;
25: II = j + n * i;
26: if (i > 0) {
27: J = II - n;
28: PetscCall(MatSetValues(A, 1, &II, 1, &J, &v, INSERT_VALUES));
29: }
30: if (i < m - 1) {
31: J = II + n;
32: PetscCall(MatSetValues(A, 1, &II, 1, &J, &v, INSERT_VALUES));
33: }
34: if (j > 0) {
35: J = II - 1;
36: PetscCall(MatSetValues(A, 1, &II, 1, &J, &v, INSERT_VALUES));
37: }
38: if (j < n - 1) {
39: J = II + 1;
40: PetscCall(MatSetValues(A, 1, &II, 1, &J, &v, INSERT_VALUES));
41: }
42: v = 4.0;
43: PetscCall(MatSetValues(A, 1, &II, 1, &II, &v, INSERT_VALUES));
44: }
45: }
46: PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
47: PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));
48: #if defined(PETSC_USE_SOCKET_VIEWER)
49: PetscCall(MatView(A, PETSC_VIEWER_SOCKET_WORLD));
50: #endif
51: PetscCall(VecCreateSeq(PETSC_COMM_SELF, m, &x));
52: PetscCall(VecSet(x, one));
53: #if defined(PETSC_USE_SOCKET_VIEWER)
54: PetscCall(VecView(x, PETSC_VIEWER_SOCKET_WORLD));
55: #endif
57: PetscCall(PetscSleep(30));
59: PetscCall(VecDestroy(&x));
60: PetscCall(MatDestroy(&A));
61: PetscCall(PetscFinalize());
62: return 0;
63: }
65: /*TEST
67: test:
68: TODO: cannot test with socket viewer
70: TEST*/