Actual source code: ex195.c
1: /*
2: * ex195.c
3: *
4: * Created on: Aug 24, 2015
5: * Author: Fande Kong <fdkong.jd@gmail.com>
6: */
8: static char help[] = " Demonstrate the use of MatConvert_Nest_AIJ\n";
10: #include <petscmat.h>
12: int main(int argc, char **args)
13: {
14: Mat A1, A2, A3, A4, A5, B, C, C1, nest;
15: Mat mata[4];
16: Mat aij;
17: MPI_Comm comm;
18: PetscInt m, M, n, istart, iend, ii, i, J, j, K = 10;
19: PetscScalar v;
20: PetscMPIInt size;
21: PetscBool equal;
23: PetscFunctionBeginUser;
24: PetscCall(PetscInitialize(&argc, &args, (char *)0, help));
25: comm = PETSC_COMM_WORLD;
26: PetscCallMPI(MPI_Comm_size(comm, &size));
28: /*
29: Assemble the matrix for the five point stencil, YET AGAIN
30: */
31: PetscCall(MatCreate(comm, &A1));
32: m = 2, n = 2;
33: PetscCall(MatSetSizes(A1, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n));
34: PetscCall(MatSetFromOptions(A1));
35: PetscCall(MatSetUp(A1));
36: PetscCall(MatGetOwnershipRange(A1, &istart, &iend));
37: for (ii = istart; ii < iend; ii++) {
38: v = -1.0;
39: i = ii / n;
40: j = ii - i * n;
41: if (i > 0) {
42: J = ii - n;
43: PetscCall(MatSetValues(A1, 1, &ii, 1, &J, &v, INSERT_VALUES));
44: }
45: if (i < m - 1) {
46: J = ii + n;
47: PetscCall(MatSetValues(A1, 1, &ii, 1, &J, &v, INSERT_VALUES));
48: }
49: if (j > 0) {
50: J = ii - 1;
51: PetscCall(MatSetValues(A1, 1, &ii, 1, &J, &v, INSERT_VALUES));
52: }
53: if (j < n - 1) {
54: J = ii + 1;
55: PetscCall(MatSetValues(A1, 1, &ii, 1, &J, &v, INSERT_VALUES));
56: }
57: v = 4.0;
58: PetscCall(MatSetValues(A1, 1, &ii, 1, &ii, &v, INSERT_VALUES));
59: }
60: PetscCall(MatAssemblyBegin(A1, MAT_FINAL_ASSEMBLY));
61: PetscCall(MatAssemblyEnd(A1, MAT_FINAL_ASSEMBLY));
62: PetscCall(MatView(A1, PETSC_VIEWER_STDOUT_WORLD));
64: PetscCall(MatDuplicate(A1, MAT_COPY_VALUES, &A2));
65: PetscCall(MatDuplicate(A1, MAT_COPY_VALUES, &A3));
66: PetscCall(MatDuplicate(A1, MAT_COPY_VALUES, &A4));
68: /*create a nest matrix */
69: PetscCall(MatCreate(comm, &nest));
70: PetscCall(MatSetType(nest, MATNEST));
71: mata[0] = A1, mata[1] = A2, mata[2] = A3, mata[3] = A4;
72: PetscCall(MatNestSetSubMats(nest, 2, NULL, 2, NULL, mata));
73: PetscCall(MatSetUp(nest));
74: PetscCall(MatConvert(nest, MATAIJ, MAT_INITIAL_MATRIX, &aij));
75: PetscCall(MatView(aij, PETSC_VIEWER_STDOUT_WORLD));
77: /* create a dense matrix */
78: PetscCall(MatGetSize(nest, &M, NULL));
79: PetscCall(MatGetLocalSize(nest, &m, NULL));
80: PetscCall(MatCreateDense(comm, m, PETSC_DECIDE, M, K, NULL, &B));
81: PetscCall(MatSetRandom(B, NULL));
83: /* C = nest*B_dense */
84: PetscCall(MatMatMult(nest, B, MAT_INITIAL_MATRIX, PETSC_DEFAULT, &C));
85: PetscCall(MatMatMult(nest, B, MAT_REUSE_MATRIX, PETSC_DEFAULT, &C));
86: PetscCall(MatMatMultEqual(nest, B, C, 10, &equal));
87: PetscCheck(equal, PETSC_COMM_WORLD, PETSC_ERR_PLIB, "Error in C != nest*B_dense");
89: /* Test B = nest*C, reuse C and B with MatProductCreateWithMat() */
90: /* C has been obtained from nest*B. Clear internal data structures related to factors to prevent circular references */
91: PetscCall(MatProductClear(C));
92: PetscCall(MatProductCreateWithMat(nest, C, NULL, B));
93: PetscCall(MatProductSetType(B, MATPRODUCT_AB));
94: PetscCall(MatProductSetFromOptions(B));
95: PetscCall(MatProductSymbolic(B));
96: PetscCall(MatProductNumeric(B));
97: PetscCall(MatMatMultEqual(nest, C, B, 10, &equal));
98: PetscCheck(equal, PETSC_COMM_WORLD, PETSC_ERR_PLIB, "Error in B != nest*C_dense");
99: PetscCall(MatConvert(nest, MATAIJ, MAT_INPLACE_MATRIX, &nest));
100: PetscCall(MatEqual(nest, aij, &equal));
101: PetscCheck(equal, PETSC_COMM_WORLD, PETSC_ERR_PLIB, "Error in aij != nest");
102: PetscCall(MatDestroy(&nest));
104: if (size > 1) { /* Do not know why this test fails for size = 1 */
105: PetscCall(MatCreateTranspose(A1, &A5)); /* A1 is symmetric */
106: mata[0] = A5;
107: PetscCall(MatCreate(comm, &nest));
108: PetscCall(MatSetType(nest, MATNEST));
109: PetscCall(MatNestSetSubMats(nest, 2, NULL, 2, NULL, mata));
110: PetscCall(MatSetUp(nest));
111: PetscCall(MatMatMult(nest, B, MAT_INITIAL_MATRIX, PETSC_DEFAULT, &C1));
112: PetscCall(MatMatMult(nest, B, MAT_REUSE_MATRIX, PETSC_DEFAULT, &C1));
114: PetscCall(MatMatMultEqual(nest, B, C1, 10, &equal));
115: PetscCheck(equal, PETSC_COMM_WORLD, PETSC_ERR_PLIB, "Error in C1 != C");
116: PetscCall(MatDestroy(&C1));
117: PetscCall(MatDestroy(&A5));
118: PetscCall(MatDestroy(&nest));
119: }
121: PetscCall(MatDestroy(&C));
122: PetscCall(MatDestroy(&B));
123: PetscCall(MatDestroy(&aij));
124: PetscCall(MatDestroy(&A1));
125: PetscCall(MatDestroy(&A2));
126: PetscCall(MatDestroy(&A3));
127: PetscCall(MatDestroy(&A4));
128: PetscCall(PetscFinalize());
129: return 0;
130: }
132: /*TEST
134: test:
135: nsize: 2
137: test:
138: suffix: 2
140: TEST*/