1 static char help[] = "Test MatTransposeMatMult() \n\n"; 2 3 /* Example: 4 mpiexec -n 8 ./ex209 -f <inputfile> (e.g., inputfile=ceres_solver_iteration_001_A.petsc) 5 */ 6 7 #include <petscmat.h> 8 9 int main(int argc,char **args) 10 { 11 Mat A,C,AtA,B; 12 PetscViewer fd; 13 char file[PETSC_MAX_PATH_LEN]; 14 PetscReal fill = 4.0; 15 PetscMPIInt rank,size; 16 PetscBool equal; 17 PetscInt i,m,n,rstart,rend; 18 PetscScalar one=1.0; 19 20 PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 21 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 22 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 23 PetscCall(PetscOptionsGetString(NULL,NULL,"-f",file,sizeof(file),NULL)); 24 25 /* Load matrix A */ 26 PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,FILE_MODE_READ,&fd)); 27 PetscCall(MatCreate(PETSC_COMM_WORLD,&A)); 28 PetscCall(MatSetType(A,MATAIJ)); 29 PetscCall(MatLoad(A,fd)); 30 PetscCall(PetscViewerDestroy(&fd)); 31 32 /* Create identity matrix B */ 33 PetscCall(MatGetLocalSize(A,&m,&n)); 34 PetscCall(MatCreate(PETSC_COMM_WORLD,&B)); 35 PetscCall(MatSetSizes(B,m,m,PETSC_DECIDE,PETSC_DECIDE)); 36 PetscCall(MatSetType(B,MATAIJ)); 37 PetscCall(MatSetFromOptions(B)); 38 PetscCall(MatSetUp(B)); 39 40 PetscCall(MatGetOwnershipRange(B,&rstart,&rend)); 41 for (i=rstart; i<rend; i++) { 42 PetscCall(MatSetValues(B,1,&i,1,&i,&one,INSERT_VALUES)); 43 } 44 PetscCall(MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY)); 45 PetscCall(MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY)); 46 47 /* Compute AtA = A^T*B*A, B = identity matrix */ 48 PetscCall(MatPtAP(B,A,MAT_INITIAL_MATRIX,fill,&AtA)); 49 PetscCall(MatPtAP(B,A,MAT_REUSE_MATRIX,fill,&AtA)); 50 if (rank == 0) printf("C = A^T*B*A is done...\n"); 51 PetscCall(MatDestroy(&B)); 52 53 /* Compute C = A^T*A */ 54 PetscCall(MatTransposeMatMult(A,A,MAT_INITIAL_MATRIX,fill,&C)); 55 if (rank == 0) printf("C = A^T*A is done...\n"); 56 PetscCall(MatTransposeMatMult(A,A,MAT_REUSE_MATRIX,fill,&C)); 57 if (rank == 0) printf("REUSE C = A^T*A is done...\n"); 58 59 /* Compare C and AtA */ 60 PetscCall(MatMultEqual(C,AtA,20,&equal)); 61 PetscCheck(equal,PETSC_COMM_SELF,PETSC_ERR_ARG_WRONGSTATE,"A^T*A != At*A"); 62 PetscCall(MatDestroy(&AtA)); 63 64 PetscCall(MatDestroy(&C)); 65 PetscCall(MatDestroy(&A)); 66 PetscCall(PetscFinalize()); 67 return 0; 68 } 69 70 /*TEST 71 72 test: 73 requires: datafilespath !complex double !defined(PETSC_USE_64BIT_INDICES) 74 args: -f ${DATAFILESPATH}/matrices/arco1 75 76 test: 77 suffix: 2 78 nsize: 4 79 requires: datafilespath !complex double !defined(PETSC_USE_64BIT_INDICES) 80 args: -f ${DATAFILESPATH}/matrices/arco1 -matptap_via nonscalable 81 82 TEST*/ 83