1 static char help[] = "Check the difference of the two matrices \n\ 2 Reads PETSc matrix A and B, then check B=A-B \n\ 3 Input parameters include\n\ 4 -fA <input_file> -fB <input_file> \n\n"; 5 6 #include <petscmat.h> 7 8 #undef WRITEFILE 9 PetscInt main(PetscInt argc,char **args) 10 { 11 Mat A,B; 12 PetscViewer fd; 13 char file[2][PETSC_MAX_PATH_LEN]; 14 PetscBool flg; 15 PetscErrorCode ierr; 16 PetscMPIInt size; 17 PetscInt ma,na,mb,nb; 18 19 ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 20 ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr); 21 if (size != 1) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP,"This is a uniprocessor example only!"); 22 23 /* read the two matrices, A and B */ 24 ierr = PetscOptionsGetString(NULL,NULL,"-fA",file[0],sizeof(file[0]),&flg);CHKERRQ(ierr); 25 if (!flg) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_USER,"Must indicate binary file with the -fA options"); 26 ierr = PetscOptionsGetString(NULL,NULL,"-fB",file[1],sizeof(file[1]),&flg);CHKERRQ(ierr); 27 if (!flg) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_USER,"Must indicate binary file with the -fP options"); 28 29 /* Load matrices */ 30 ierr = PetscViewerBinaryOpen(PETSC_COMM_WORLD,file[0],FILE_MODE_READ,&fd);CHKERRQ(ierr); 31 ierr = MatCreate(PETSC_COMM_WORLD,&A);CHKERRQ(ierr); 32 ierr = MatLoad(A,fd);CHKERRQ(ierr); 33 ierr = PetscViewerDestroy(&fd);CHKERRQ(ierr); 34 printf("\n A:\n"); 35 printf("----------------------\n"); 36 ierr = MatView(A,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 37 ierr = MatGetSize(A,&ma,&na);CHKERRQ(ierr); 38 39 ierr = PetscViewerBinaryOpen(PETSC_COMM_WORLD,file[1],FILE_MODE_READ,&fd);CHKERRQ(ierr); 40 ierr = MatCreate(PETSC_COMM_WORLD,&B);CHKERRQ(ierr); 41 ierr = MatLoad(B,fd);CHKERRQ(ierr); 42 ierr = PetscViewerDestroy(&fd);CHKERRQ(ierr); 43 printf("\n B:\n"); 44 printf("----------------------\n"); 45 ierr = MatView(B,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 46 ierr = MatGetSize(B,&mb,&nb);CHKERRQ(ierr); 47 48 /* Compute B = -A + B */ 49 if (ma != mb || na != nb) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_SIZ,"nonconforming matrix size"); 50 ierr = MatAXPY(B,-1.0,A,DIFFERENT_NONZERO_PATTERN);CHKERRQ(ierr); 51 printf("\n B - A:\n"); 52 printf("----------------------\n"); 53 ierr = MatView(B,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 54 55 ierr = MatDestroy(&B);CHKERRQ(ierr); 56 ierr = MatDestroy(&A);CHKERRQ(ierr); 57 ierr = PetscFinalize(); 58 return ierr; 59 } 60