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 aij;
16: MPI_Comm comm;
17: PetscInt m, M, n, istart, iend, ii, i, J, j, K = 10;
18: PetscScalar v;
19: PetscMPIInt size;
20: PetscBool equal, test = PETSC_FALSE, test_null = PETSC_FALSE;
22: PetscFunctionBeginUser;
23: PetscCall(PetscInitialize(&argc, &args, NULL, help));
24: comm = PETSC_COMM_WORLD;
25: PetscCallMPI(MPI_Comm_size(comm, &size));
27: /*
28: Assemble the matrix for the five point stencil, YET AGAIN
29: */
30: PetscCall(MatCreate(comm, &A1));
31: m = 2, n = 2;
32: PetscCall(MatSetSizes(A1, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n));
33: PetscCall(MatSetFromOptions(A1));
34: PetscCall(MatSetUp(A1));
35: PetscCall(MatGetOwnershipRange(A1, &istart, &iend));
36: for (ii = istart; ii < iend; ii++) {
37: v = -1.0;
38: i = ii / n;
39: j = ii - i * n;
40: if (i > 0) {
41: J = ii - n;
42: PetscCall(MatSetValues(A1, 1, &ii, 1, &J, &v, INSERT_VALUES));
43: }
44: if (i < m - 1) {
45: J = ii + n;
46: PetscCall(MatSetValues(A1, 1, &ii, 1, &J, &v, INSERT_VALUES));
47: }
48: if (j > 0) {
49: J = ii - 1;
50: PetscCall(MatSetValues(A1, 1, &ii, 1, &J, &v, INSERT_VALUES));
51: }
52: if (j < n - 1) {
53: J = ii + 1;
54: PetscCall(MatSetValues(A1, 1, &ii, 1, &J, &v, INSERT_VALUES));
55: }
56: v = 4.0;
57: PetscCall(MatSetValues(A1, 1, &ii, 1, &ii, &v, INSERT_VALUES));
58: }
59: PetscCall(MatAssemblyBegin(A1, MAT_FINAL_ASSEMBLY));
60: PetscCall(MatAssemblyEnd(A1, MAT_FINAL_ASSEMBLY));
61: PetscCall(MatView(A1, PETSC_VIEWER_STDOUT_WORLD));
63: PetscCall(MatDuplicate(A1, MAT_COPY_VALUES, &A2));
64: PetscCall(MatDuplicate(A1, MAT_COPY_VALUES, &A3));
65: PetscCall(MatDuplicate(A1, MAT_COPY_VALUES, &A4));
67: /* create a nest matrix */
68: PetscCall(MatCreate(comm, &nest));
69: PetscCall(MatSetType(nest, MATNEST));
70: PetscCall(PetscOptionsGetBool(NULL, NULL, "-test_null", &test_null, NULL));
71: if (test_null) {
72: IS is[2];
73: PetscInt st;
75: PetscCall(MatGetLocalSize(A1, &m, NULL));
76: PetscCall(MatGetOwnershipRange(A1, &st, NULL));
77: PetscCall(ISCreateStride(comm, m, st, 2, &is[0]));
78: PetscCall(ISCreateStride(comm, m, st + 1, 2, &is[1]));
79: PetscCall(MatNestSetSubMats(nest, 2, is, 2, is, NULL));
80: PetscCall(ISDestroy(&is[0]));
81: PetscCall(ISDestroy(&is[1]));
82: } else {
83: Mat mata[] = {A1, A2, A3, A4};
85: PetscCall(MatNestSetSubMats(nest, 2, NULL, 2, NULL, mata));
86: }
87: PetscCall(MatSetUp(nest));
89: /* test matrix product error messages */
90: PetscCall(PetscOptionsGetBool(NULL, NULL, "-test_nest*nest", &test, NULL));
91: if (test) PetscCall(MatMatMult(nest, nest, MAT_INITIAL_MATRIX, PETSC_DETERMINE, &C));
93: PetscCall(PetscOptionsGetBool(NULL, NULL, "-test_matproductsetfromoptions", &test, NULL));
94: if (test) {
95: PetscCall(MatProductCreate(nest, nest, NULL, &C));
96: PetscCall(MatProductSetType(C, MATPRODUCT_AB));
97: PetscCall(MatProductSymbolic(C));
98: }
100: PetscCall(PetscOptionsGetBool(NULL, NULL, "-test_matproductsymbolic", &test, NULL));
101: if (test) {
102: PetscCall(MatProductCreate(nest, nest, NULL, &C));
103: PetscCall(MatProductSetType(C, MATPRODUCT_AB));
104: PetscCall(MatProductSetFromOptions(C));
105: PetscCall(MatProductSymbolic(C));
106: }
108: PetscCall(MatConvert(nest, MATAIJ, MAT_INITIAL_MATRIX, &aij));
109: PetscCall(MatView(aij, PETSC_VIEWER_STDOUT_WORLD));
111: /* create a dense matrix */
112: PetscCall(MatGetSize(nest, &M, NULL));
113: PetscCall(MatGetLocalSize(nest, &m, NULL));
114: PetscCall(MatCreateDense(comm, m, PETSC_DECIDE, M, K, NULL, &B));
115: PetscCall(MatSetRandom(B, NULL));
117: /* C = nest*B_dense */
118: PetscCall(MatMatMult(nest, B, MAT_INITIAL_MATRIX, PETSC_DETERMINE, &C));
119: PetscCall(MatMatMult(nest, B, MAT_REUSE_MATRIX, PETSC_DETERMINE, &C));
120: PetscCall(MatMatMultEqual(nest, B, C, 10, &equal));
121: PetscCheck(equal, PETSC_COMM_WORLD, PETSC_ERR_PLIB, "Error in C != nest*B_dense");
123: /* Test B = nest*C, reuse C and B with MatProductCreateWithMat() */
124: /* C has been obtained from nest*B. Clear internal data structures related to factors to prevent circular references */
125: PetscCall(MatProductClear(C));
126: PetscCall(MatProductCreateWithMat(nest, C, NULL, B));
127: PetscCall(MatProductSetType(B, MATPRODUCT_AB));
128: PetscCall(MatProductSetFromOptions(B));
129: PetscCall(MatProductSymbolic(B));
130: PetscCall(MatProductNumeric(B));
131: PetscCall(MatMatMultEqual(nest, C, B, 10, &equal));
132: PetscCheck(equal, PETSC_COMM_WORLD, PETSC_ERR_PLIB, "Error in B != nest*C_dense");
133: PetscCall(MatConvert(nest, MATAIJ, MAT_INPLACE_MATRIX, &nest));
134: PetscCall(MatEqual(nest, aij, &equal));
135: PetscCheck(equal, PETSC_COMM_WORLD, PETSC_ERR_PLIB, "Error in aij != nest");
137: /* Test with virtual block */
138: PetscCall(MatCreateTranspose(A1, &A5)); /* A1 is symmetric */
139: PetscCall(MatNestSetSubMat(nest, 0, 0, A5));
140: PetscCall(MatMatMult(nest, B, MAT_INITIAL_MATRIX, PETSC_DETERMINE, &C1));
141: PetscCall(MatMatMult(nest, B, MAT_REUSE_MATRIX, PETSC_DETERMINE, &C1));
142: PetscCall(MatMatMultEqual(nest, B, C1, 10, &equal));
143: PetscCheck(equal, PETSC_COMM_WORLD, PETSC_ERR_PLIB, "Error in C1 != C");
144: PetscCall(MatDestroy(&C1));
145: PetscCall(MatDestroy(&A5));
147: PetscCall(MatDestroy(&nest));
148: PetscCall(MatDestroy(&C));
149: PetscCall(MatDestroy(&B));
150: PetscCall(MatDestroy(&aij));
151: PetscCall(MatDestroy(&A1));
152: PetscCall(MatDestroy(&A2));
153: PetscCall(MatDestroy(&A3));
154: PetscCall(MatDestroy(&A4));
155: PetscCall(PetscFinalize());
156: return 0;
157: }
159: /*TEST
161: test:
162: diff_args: -j
163: nsize: 2
164: suffix: 1
166: test:
167: diff_args: -j
168: nsize: 2
169: suffix: 1_null
170: args: -test_null
172: test:
173: diff_args: -j
174: suffix: 2
176: test:
177: diff_args: -j
178: suffix: 2_null
179: args: -test_null
181: TEST*/