1 static char help[] = "Test MatCreate() with MAT_STRUCTURE_ONLY .\n\n";
2
3 #include <petscmat.h>
4
main(int argc,char ** argv)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;
12
13 PetscFunctionBeginUser;
14 PetscCall(PetscInitialize(&argc, &argv, NULL, 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!");
17
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;
22
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));
39
40 /* Free data structures */
41 PetscCall(MatDestroy(&mat));
42 PetscCall(PetscFinalize());
43 return 0;
44 }
45
46 /*TEST
47
48 test:
49 output_file: output/ex107.out
50
51 test:
52 suffix: 2
53 args: -mat_type baij -mat_block_size 2 -m 10
54
55 TEST*/
56