Actual source code: ex4.c
1: static char help[] = "Creates a matrix, inserts some values, and tests MatCreateSubMatrices() and MatZeroEntries().\n\n";
3: #include <petscmat.h>
5: int main(int argc, char **argv)
6: {
7: Mat mat, submat, submat1, *submatrices;
8: PetscInt m = 10, n = 10, i = 4, tmp, rstart, rend;
9: IS irow, icol;
10: PetscScalar value = 1.0;
11: PetscViewer sviewer;
12: PetscBool allA = PETSC_FALSE;
14: PetscFunctionBeginUser;
15: PetscCall(PetscInitialize(&argc, &argv, (char *)0, help));
16: PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD, PETSC_VIEWER_ASCII_COMMON));
17: PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_SELF, PETSC_VIEWER_ASCII_COMMON));
19: PetscCall(MatCreate(PETSC_COMM_WORLD, &mat));
20: PetscCall(MatSetSizes(mat, PETSC_DECIDE, PETSC_DECIDE, m, n));
21: PetscCall(MatSetFromOptions(mat));
22: PetscCall(MatSetUp(mat));
23: PetscCall(MatGetOwnershipRange(mat, &rstart, &rend));
24: for (i = rstart; i < rend; i++) {
25: value = (PetscReal)i + 1;
26: tmp = i % 5;
27: PetscCall(MatSetValues(mat, 1, &tmp, 1, &i, &value, INSERT_VALUES));
28: }
29: PetscCall(MatAssemblyBegin(mat, MAT_FINAL_ASSEMBLY));
30: PetscCall(MatAssemblyEnd(mat, MAT_FINAL_ASSEMBLY));
31: PetscCall(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_WORLD, "Original matrix\n"));
32: PetscCall(MatView(mat, PETSC_VIEWER_STDOUT_WORLD));
34: /* Test MatCreateSubMatrix_XXX_All(), i.e., submatrix = A */
35: PetscCall(PetscOptionsGetBool(NULL, NULL, "-test_all", &allA, NULL));
36: if (allA) {
37: PetscCall(ISCreateStride(PETSC_COMM_SELF, m, 0, 1, &irow));
38: PetscCall(ISCreateStride(PETSC_COMM_SELF, n, 0, 1, &icol));
39: PetscCall(MatCreateSubMatrices(mat, 1, &irow, &icol, MAT_INITIAL_MATRIX, &submatrices));
40: PetscCall(MatCreateSubMatrices(mat, 1, &irow, &icol, MAT_REUSE_MATRIX, &submatrices));
41: submat = *submatrices;
43: /* sviewer will cause the submatrices (one per processor) to be printed in the correct order */
44: PetscCall(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_WORLD, "\nSubmatrices with all\n"));
45: PetscCall(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_WORLD, "--------------------\n"));
46: PetscCall(PetscViewerGetSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sviewer));
47: PetscCall(MatView(submat, sviewer));
48: PetscCall(PetscViewerRestoreSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sviewer));
49: PetscCall(PetscViewerFlush(PETSC_VIEWER_STDOUT_WORLD));
51: PetscCall(ISDestroy(&irow));
52: PetscCall(ISDestroy(&icol));
54: /* test getting a reference on a submat */
55: PetscCall(PetscObjectReference((PetscObject)submat));
56: PetscCall(MatDestroySubMatrices(1, &submatrices));
57: PetscCall(MatDestroy(&submat));
58: }
60: /* Form submatrix with rows 2-4 and columns 4-8 */
61: PetscCall(ISCreateStride(PETSC_COMM_SELF, 3, 2, 1, &irow));
62: PetscCall(ISCreateStride(PETSC_COMM_SELF, 5, 4, 1, &icol));
63: PetscCall(MatCreateSubMatrices(mat, 1, &irow, &icol, MAT_INITIAL_MATRIX, &submatrices));
64: submat = *submatrices;
66: /* Test reuse submatrices */
67: PetscCall(MatCreateSubMatrices(mat, 1, &irow, &icol, MAT_REUSE_MATRIX, &submatrices));
69: /* sviewer will cause the submatrices (one per processor) to be printed in the correct order */
70: PetscCall(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_WORLD, "\nSubmatrices\n"));
71: PetscCall(PetscViewerGetSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sviewer));
72: PetscCall(MatView(submat, sviewer));
73: PetscCall(PetscViewerRestoreSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sviewer));
74: PetscCall(PetscViewerFlush(PETSC_VIEWER_STDOUT_WORLD));
75: PetscCall(PetscObjectReference((PetscObject)submat));
76: PetscCall(MatDestroySubMatrices(1, &submatrices));
77: PetscCall(MatDestroy(&submat));
79: /* Form submatrix with rows 2-4 and all columns */
80: PetscCall(ISDestroy(&icol));
81: PetscCall(ISCreateStride(PETSC_COMM_SELF, 10, 0, 1, &icol));
82: PetscCall(MatCreateSubMatrices(mat, 1, &irow, &icol, MAT_INITIAL_MATRIX, &submatrices));
83: PetscCall(MatCreateSubMatrices(mat, 1, &irow, &icol, MAT_REUSE_MATRIX, &submatrices));
84: submat = *submatrices;
86: PetscCall(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_WORLD, "\nSubmatrices with allcolumns\n"));
87: PetscCall(PetscViewerGetSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sviewer));
88: PetscCall(MatView(submat, sviewer));
89: PetscCall(PetscViewerRestoreSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sviewer));
90: PetscCall(PetscViewerFlush(PETSC_VIEWER_STDOUT_WORLD));
92: /* Test MatDuplicate */
93: PetscCall(MatDuplicate(submat, MAT_COPY_VALUES, &submat1));
94: PetscCall(MatDestroy(&submat1));
96: /* Zero the original matrix */
97: PetscCall(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_WORLD, "Original zeroed matrix\n"));
98: PetscCall(MatZeroEntries(mat));
99: PetscCall(MatView(mat, PETSC_VIEWER_STDOUT_WORLD));
101: PetscCall(ISDestroy(&irow));
102: PetscCall(ISDestroy(&icol));
103: PetscCall(PetscObjectReference((PetscObject)submat));
104: PetscCall(MatDestroySubMatrices(1, &submatrices));
105: PetscCall(MatDestroy(&submat));
106: PetscCall(MatDestroy(&mat));
107: PetscCall(PetscFinalize());
108: return 0;
109: }
111: /*TEST
113: test:
114: args: -mat_type aij
116: test:
117: suffix: 2
118: args: -mat_type dense
120: test:
121: suffix: 3
122: nsize: 3
123: args: -mat_type aij
125: test:
126: suffix: 4
127: nsize: 3
128: args: -mat_type dense
130: test:
131: suffix: 5
132: nsize: 3
133: args: -mat_type aij -test_all
135: TEST*/