Actual source code: ex107.c
1: static char help[] = "Test MatCreate() with MAT_STRUCTURE_ONLY .\n\n";
3: #include <petscmat.h>
5: int main(int argc, char **argv)
6: {
7: Mat mat;
8: PetscInt m = 7, n, i, j, rstart, rend;
9: PetscMPIInt size;
10: PetscScalar v;
11: PetscBool struct_only = PETSC_TRUE;
13: PetscFunctionBeginUser;
14: PetscCall(PetscInitialize(&argc, &argv, (char *)0, help));
15: PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
16: PetscCheck(size == 1, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, "This is a uniprocessor example only!");
18: PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD, PETSC_VIEWER_ASCII_COMMON));
19: PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL));
20: PetscCall(PetscOptionsGetBool(NULL, NULL, "-struct_only", &struct_only, NULL));
21: n = m;
23: /* ------- Assemble matrix, test MatValid() --------- */
24: PetscCall(MatCreate(PETSC_COMM_WORLD, &mat));
25: PetscCall(MatSetSizes(mat, PETSC_DECIDE, PETSC_DECIDE, m, n));
26: PetscCall(MatSetFromOptions(mat));
27: if (struct_only) PetscCall(MatSetOption(mat, MAT_STRUCTURE_ONLY, PETSC_TRUE));
28: PetscCall(MatSetUp(mat));
29: PetscCall(MatGetOwnershipRange(mat, &rstart, &rend));
30: for (i = rstart; i < rend; i++) {
31: for (j = 0; j < n; j++) {
32: v = 10.0 * i + j;
33: PetscCall(MatSetValues(mat, 1, &i, 1, &j, &v, INSERT_VALUES));
34: }
35: }
36: PetscCall(MatAssemblyBegin(mat, MAT_FINAL_ASSEMBLY));
37: PetscCall(MatAssemblyEnd(mat, MAT_FINAL_ASSEMBLY));
38: PetscCall(MatView(mat, PETSC_VIEWER_STDOUT_WORLD));
40: /* Free data structures */
41: PetscCall(MatDestroy(&mat));
42: PetscCall(PetscFinalize());
43: return 0;
44: }
46: /*TEST
48: test:
49: output_file: output/ex107.out
51: test:
52: suffix: 2
53: args: -mat_type baij -mat_block_size 2 -m 10
55: TEST*/