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 PetscFunctionBeginUser; 21 PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 22 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 23 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 24 PetscCall(PetscOptionsGetString(NULL,NULL,"-f",file,sizeof(file),NULL)); 25 26 /* Load matrix A */ 27 PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,FILE_MODE_READ,&fd)); 28 PetscCall(MatCreate(PETSC_COMM_WORLD,&A)); 29 PetscCall(MatSetType(A,MATAIJ)); 30 PetscCall(MatLoad(A,fd)); 31 PetscCall(PetscViewerDestroy(&fd)); 32 33 /* Create identity matrix B */ 34 PetscCall(MatGetLocalSize(A,&m,&n)); 35 PetscCall(MatCreate(PETSC_COMM_WORLD,&B)); 36 PetscCall(MatSetSizes(B,m,m,PETSC_DECIDE,PETSC_DECIDE)); 37 PetscCall(MatSetType(B,MATAIJ)); 38 PetscCall(MatSetFromOptions(B)); 39 PetscCall(MatSetUp(B)); 40 41 PetscCall(MatGetOwnershipRange(B,&rstart,&rend)); 42 for (i=rstart; i<rend; i++) { 43 PetscCall(MatSetValues(B,1,&i,1,&i,&one,INSERT_VALUES)); 44 } 45 PetscCall(MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY)); 46 PetscCall(MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY)); 47 48 /* Compute AtA = A^T*B*A, B = identity matrix */ 49 PetscCall(MatPtAP(B,A,MAT_INITIAL_MATRIX,fill,&AtA)); 50 PetscCall(MatPtAP(B,A,MAT_REUSE_MATRIX,fill,&AtA)); 51 if (rank == 0) printf("C = A^T*B*A is done...\n"); 52 PetscCall(MatDestroy(&B)); 53 54 /* Compute C = A^T*A */ 55 PetscCall(MatTransposeMatMult(A,A,MAT_INITIAL_MATRIX,fill,&C)); 56 if (rank == 0) printf("C = A^T*A is done...\n"); 57 PetscCall(MatTransposeMatMult(A,A,MAT_REUSE_MATRIX,fill,&C)); 58 if (rank == 0) printf("REUSE C = A^T*A is done...\n"); 59 60 /* Compare C and AtA */ 61 PetscCall(MatMultEqual(C,AtA,20,&equal)); 62 PetscCheck(equal,PETSC_COMM_SELF,PETSC_ERR_ARG_WRONGSTATE,"A^T*A != At*A"); 63 PetscCall(MatDestroy(&AtA)); 64 65 PetscCall(MatDestroy(&C)); 66 PetscCall(MatDestroy(&A)); 67 PetscCall(PetscFinalize()); 68 return 0; 69 } 70 71 /*TEST 72 73 test: 74 requires: datafilespath !complex double !defined(PETSC_USE_64BIT_INDICES) 75 args: -f ${DATAFILESPATH}/matrices/arco1 76 77 test: 78 suffix: 2 79 nsize: 4 80 requires: datafilespath !complex double !defined(PETSC_USE_64BIT_INDICES) 81 args: -f ${DATAFILESPATH}/matrices/arco1 -matptap_via nonscalable 82 83 TEST*/ 84