1 static char help[] = "Test MatCreateNest with block sizes.\n"; 2 3 #include <petscmat.h> 4 5 int main(int argc, char **argv) 6 { 7 Mat A, B, C, mats[2]; 8 ISLocalToGlobalMapping cmap, rmap; 9 const PetscInt indices[1] = {0}; 10 PetscMPIInt size; 11 12 PetscFunctionBeginUser; 13 PetscCall(PetscInitialize(&argc, &argv, NULL, help)); 14 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 15 PetscCheck(size == 1, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, "Only coded for one process"); 16 PetscCall(MatCreate(PETSC_COMM_WORLD, &A)); 17 PetscCall(MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, 1, 2)); 18 PetscCall(MatSetBlockSizes(A, 1, 2)); 19 PetscCall(MatSetType(A, MATAIJ)); 20 PetscCall(ISLocalToGlobalMappingCreate(PETSC_COMM_WORLD, 2, 1, indices, PETSC_COPY_VALUES, &cmap)); 21 PetscCall(ISLocalToGlobalMappingCreate(PETSC_COMM_WORLD, 1, 1, indices, PETSC_COPY_VALUES, &rmap)); 22 PetscCall(MatSetLocalToGlobalMapping(A, rmap, cmap)); 23 PetscCall(MatCreate(PETSC_COMM_WORLD, &B)); 24 PetscCall(MatSetSizes(B, PETSC_DECIDE, PETSC_DECIDE, 1, 1)); 25 PetscCall(MatSetBlockSizes(A, 1, 1)); 26 PetscCall(MatSetType(B, MATAIJ)); 27 PetscCall(MatSetLocalToGlobalMapping(B, rmap, rmap)); 28 PetscCall(ISLocalToGlobalMappingDestroy(&rmap)); 29 PetscCall(ISLocalToGlobalMappingDestroy(&cmap)); 30 PetscCall(MatSetUp(A)); 31 PetscCall(MatSetUp(B)); 32 mats[0] = A; 33 mats[1] = B; 34 PetscCall(MatCreateNest(PETSC_COMM_WORLD, 1, NULL, 2, NULL, mats, &C)); 35 PetscCall(MatSetUp(C)); 36 PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY)); 37 PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY)); 38 PetscCall(MatView(C, NULL)); 39 PetscCall(MatDestroy(&C)); 40 PetscCall(MatDestroy(&B)); 41 PetscCall(MatDestroy(&A)); 42 PetscCall(PetscFinalize()); 43 return 0; 44 } 45 46 /*TEST 47 48 test: 49 50 TEST*/ 51