1 static char help[] = "Tests repeated use of assembly for matrices.\n\n"; 2 3 #include <petscmat.h> 4 5 int main(int argc, char **args) 6 { 7 Mat C, B; 8 PetscInt i, j, m = 5, n = 2, Ii, J; 9 PetscMPIInt rank, size; 10 PetscScalar v; 11 12 PetscFunctionBeginUser; 13 PetscCall(PetscInitialize(&argc, &args, (char *)0, help)); 14 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 15 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 16 n = 2 * size; 17 18 /* create the matrix for the five point stencil, YET AGAIN*/ 19 PetscCall(MatCreate(PETSC_COMM_WORLD, &C)); 20 PetscCall(MatSetSizes(C, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n)); 21 PetscCall(MatSetFromOptions(C)); 22 PetscCall(MatSetUp(C)); 23 PetscCall(MatDuplicate(C, MAT_DO_NOT_COPY_VALUES, &B)); /* test that SeqAIJ non-preallocated matrices can be duplicated */ 24 PetscCall(MatDestroy(&C)); 25 C = B; 26 for (i = 0; i < m; i++) { 27 for (j = 2 * rank; j < 2 * rank + 2; j++) { 28 v = -1.0; 29 Ii = j + n * i; 30 if (i > 0) { 31 J = Ii - n; 32 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 33 } 34 if (i < m - 1) { 35 J = Ii + n; 36 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 37 } 38 if (j > 0) { 39 J = Ii - 1; 40 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 41 } 42 if (j < n - 1) { 43 J = Ii + 1; 44 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 45 } 46 v = 4.0; 47 PetscCall(MatSetValues(C, 1, &Ii, 1, &Ii, &v, INSERT_VALUES)); 48 } 49 } 50 PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY)); 51 PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY)); 52 for (i = 0; i < m; i++) { 53 for (j = 2 * rank; j < 2 * rank + 2; j++) { 54 v = 1.0; 55 Ii = j + n * i; 56 if (i > 0) { 57 J = Ii - n; 58 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 59 } 60 if (i < m - 1) { 61 J = Ii + n; 62 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 63 } 64 if (j > 0) { 65 J = Ii - 1; 66 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 67 } 68 if (j < n - 1) { 69 J = Ii + 1; 70 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 71 } 72 v = -4.0; 73 PetscCall(MatSetValues(C, 1, &Ii, 1, &Ii, &v, INSERT_VALUES)); 74 } 75 } 76 PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY)); 77 PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY)); 78 79 PetscCall(MatView(C, PETSC_VIEWER_STDOUT_WORLD)); 80 81 PetscCall(MatDestroy(&C)); 82 PetscCall(PetscFinalize()); 83 return 0; 84 } 85 86 /*TEST 87 88 test: 89 90 TEST*/ 91