1 2 static char help[] = "Tests MatMPIAIJSetPreallocationCSR()\n\n"; 3 4 /* 5 Include "petscmat.h" so that we can use matrices. Note that this file 6 automatically includes: 7 petscsys.h - base PETSc routines petscvec.h - vectors 8 petscmat.h - matrices 9 petscis.h - index sets 10 petscviewer.h - viewers 11 */ 12 #include <petscmat.h> 13 14 int main(int argc,char **args) 15 { 16 Mat A; 17 PetscInt *ia,*ja; 18 PetscMPIInt rank,size; 19 20 PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 21 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 22 PetscCheck(size == 4,PETSC_COMM_WORLD,PETSC_ERR_WRONG_MPI_SIZE,"Must run with 4 processors"); 23 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 24 25 PetscCall(PetscMalloc1(5,&ia)); 26 PetscCall(PetscMalloc1(16,&ja)); 27 if (rank == 0) { 28 ja[0] = 1; ja[1] = 4; ja[2] = 0; ja[3] = 2; ja[4] = 5; ja[5] = 1; ja[6] = 3; ja[7] = 6; 29 ja[8] = 2; ja[9] = 7; 30 ia[0] = 0; ia[1] = 2; ia[2] = 5; ia[3] = 8; ia[4] = 10; 31 } else if (rank == 1) { 32 ja[0] = 0; ja[1] = 5; ja[2] = 8; ja[3] = 1; ja[4] = 4; ja[5] = 6; ja[6] = 9; ja[7] = 2; 33 ja[8] = 5; ja[9] = 7; ja[10] = 10; ja[11] = 3; ja[12] = 6; ja[13] = 11; 34 ia[0] = 0; ia[1] = 3; ia[2] = 7; ia[3] = 11; ia[4] = 14; 35 } else if (rank == 2) { 36 ja[0] = 4; ja[1] = 9; ja[2] = 12; ja[3] = 5; ja[4] = 8; ja[5] = 10; ja[6] = 13; ja[7] = 6; 37 ja[8] = 9; ja[9] = 11; ja[10] = 14; ja[11] = 7; ja[12] = 10; ja[13] = 15; 38 ia[0] = 0; ia[1] = 3; ia[2] = 7; ia[3] = 11; ia[4] = 14; 39 } else { 40 ja[0] = 8; ja[1] = 13; ja[2] = 9; ja[3] = 12; ja[4] = 14; ja[5] = 10; ja[6] = 13; ja[7] = 15; 41 ja[8] = 11; ja[9] = 14; 42 ia[0] = 0; ia[1] = 2; ia[2] = 5; ia[3] = 8; ia[4] = 10; 43 } 44 45 PetscCall(MatCreate(PETSC_COMM_WORLD,&A)); 46 PetscCall(MatSetSizes(A,4,4,16,16)); 47 PetscCall(MatSetType(A,MATMPIAIJ)); 48 PetscCall(MatMPIAIJSetPreallocationCSR(A,ia,ja,NULL)); 49 PetscCall(PetscFree(ia)); 50 PetscCall(PetscFree(ja)); 51 PetscCall(MatView(A,PETSC_VIEWER_STDOUT_WORLD)); 52 PetscCall(MatDestroy(&A)); 53 PetscCall(PetscFinalize()); 54 return 0; 55 } 56 57 /*TEST 58 59 test: 60 nsize: 4 61 62 TEST*/ 63