1 static char help[] = "Test MatCreateSubMatrix with -mat_type nest and block sizes.\n"; 2 3 #include <petscmat.h> 4 5 int main(int argc, char **argv) { 6 Mat A, B, C, mats[6]; 7 IS rows[2]; 8 ISLocalToGlobalMapping cmap, rmap; 9 const PetscInt indices[3] = {0, 1, 2}; 10 PetscInt i; 11 PetscMPIInt size; 12 13 PetscFunctionBeginUser; 14 PetscCall(PetscInitialize(&argc, &argv, NULL, help)); 15 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 16 PetscCheck(size == 1, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, "Only coded for one process"); 17 PetscCall(MatCreate(PETSC_COMM_WORLD, &A)); 18 PetscCall(MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, 2, 1)); 19 PetscCall(MatSetBlockSizes(A, 2, 1)); 20 PetscCall(MatSetType(A, MATAIJ)); 21 PetscCall(ISLocalToGlobalMappingCreate(PETSC_COMM_WORLD, 2, 1, indices, PETSC_COPY_VALUES, &rmap)); 22 PetscCall(ISLocalToGlobalMappingCreate(PETSC_COMM_WORLD, 1, 1, indices, PETSC_COPY_VALUES, &cmap)); 23 PetscCall(MatSetLocalToGlobalMapping(A, rmap, cmap)); 24 PetscCall(ISLocalToGlobalMappingDestroy(&rmap)); 25 PetscCall(ISLocalToGlobalMappingDestroy(&cmap)); 26 PetscCall(ISLocalToGlobalMappingCreate(PETSC_COMM_WORLD, 1, 2, indices, PETSC_COPY_VALUES, &rmap)); 27 PetscCall(ISLocalToGlobalMappingCreate(PETSC_COMM_WORLD, 1, 3, indices, PETSC_COPY_VALUES, &cmap)); 28 PetscCall(MatCreate(PETSC_COMM_WORLD, &B)); 29 PetscCall(MatSetSizes(B, PETSC_DECIDE, PETSC_DECIDE, 2, 3)); 30 PetscCall(MatSetBlockSizes(B, 1, 1)); 31 PetscCall(MatSetType(B, MATAIJ)); 32 PetscCall(MatSetLocalToGlobalMapping(B, rmap, cmap)); 33 PetscCall(ISLocalToGlobalMappingDestroy(&rmap)); 34 PetscCall(ISLocalToGlobalMappingDestroy(&cmap)); 35 PetscCall(MatSetUp(A)); 36 PetscCall(MatSetUp(B)); 37 mats[0] = A; 38 mats[1] = B; 39 mats[2] = A; 40 mats[3] = NULL; 41 mats[4] = B; 42 mats[5] = A; 43 PetscCall(MatCreateNest(PETSC_COMM_WORLD, 2, NULL, 3, NULL, mats, &C)); 44 PetscCall(MatSetUp(C)); 45 PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY)); 46 PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY)); 47 PetscCall(MatView(C, NULL)); 48 PetscCall(MatNestGetISs(C, rows, NULL)); 49 for (i = 0; i < 2; i++) { 50 Mat submat; 51 IS cols[3]; 52 PetscInt j; 53 PetscCall(ISView(rows[i], NULL)); 54 PetscCall(MatCreateSubMatrix(C, rows[i], NULL, MAT_INITIAL_MATRIX, &submat)); 55 PetscCall(MatView(submat, NULL)); 56 PetscCall(MatNestGetISs(submat, NULL, cols)); 57 for (j = 0; j < 3; j++) { PetscCall(ISView(cols[j], NULL)); } 58 PetscCall(MatDestroy(&submat)); 59 } 60 PetscCall(MatDestroy(&C)); 61 PetscCall(MatDestroy(&B)); 62 PetscCall(MatDestroy(&A)); 63 PetscCall(PetscFinalize()); 64 return 0; 65 } 66 67 /*TEST 68 69 test: 70 71 TEST*/ 72