1 2 static char help[] = "Tests MatGetColumnVector()."; 3 4 #include <petscmat.h> 5 6 int main(int argc, char **args) 7 { 8 Mat C; 9 PetscInt i, j, m = 3, n = 2, Ii, J, col = 0; 10 PetscMPIInt size, rank; 11 PetscScalar v; 12 Vec yy; 13 14 PetscFunctionBeginUser; 15 PetscCall(PetscInitialize(&argc, &args, (char *)0, help)); 16 PetscCall(PetscOptionsGetInt(NULL, NULL, "-col", &col, NULL)); 17 18 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 19 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 20 n = 2 * size; 21 22 /* create the matrix for the five point stencil, YET AGAIN*/ 23 PetscCall(MatCreate(PETSC_COMM_WORLD, &C)); 24 PetscCall(MatSetSizes(C, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n)); 25 PetscCall(MatSetFromOptions(C)); 26 PetscCall(MatSeqAIJSetPreallocation(C, 5, NULL)); 27 PetscCall(MatMPIAIJSetPreallocation(C, 5, NULL, 5, NULL)); 28 PetscCall(MatSetUp(C)); 29 30 for (i = 0; i < m; i++) { 31 for (j = 2 * rank; j < 2 * rank + 2; j++) { 32 v = -1.0; 33 Ii = j + n * i; 34 if (i > 0) { 35 J = Ii - n; 36 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 37 } 38 if (i < m - 1) { 39 J = Ii + n; 40 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 41 } 42 if (j > 0) { 43 J = Ii - 1; 44 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 45 } 46 if (j < n - 1) { 47 J = Ii + 1; 48 PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 49 } 50 v = 4.0; 51 PetscCall(MatSetValues(C, 1, &Ii, 1, &Ii, &v, INSERT_VALUES)); 52 } 53 } 54 PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY)); 55 PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY)); 56 PetscCall(MatView(C, PETSC_VIEWER_STDOUT_WORLD)); 57 58 PetscCall(MatCreateVecs(C, NULL, &yy)); 59 PetscCall(VecSetFromOptions(yy)); 60 61 PetscCall(MatGetColumnVector(C, yy, col)); 62 63 PetscCall(VecView(yy, PETSC_VIEWER_STDOUT_WORLD)); 64 65 PetscCall(VecDestroy(&yy)); 66 PetscCall(MatDestroy(&C)); 67 PetscCall(PetscFinalize()); 68 return 0; 69 } 70 71 /*TEST 72 73 test: 74 nsize: 3 75 args: -col 7 76 77 test: 78 suffix: dense 79 nsize: 3 80 args: -col 7 -mat_type dense -vec_type {{mpi standard}} 81 filter: grep -v type 82 83 test: 84 requires: cuda 85 suffix: dense_cuda 86 nsize: 3 87 output_file: output/ex60_dense.out 88 args: -col 7 -mat_type {{mpidense mpidensecuda}} -vec_type {{mpi standard cuda mpicuda}} 89 filter: grep -v type 90 91 TEST*/ 92