1c4762a1bSJed Brown static char help[] = "Check the difference of the two matrices \n\ 2c4762a1bSJed Brown Reads PETSc matrix A and B, then check B=A-B \n\ 3c4762a1bSJed Brown Input parameters include\n\ 4c4762a1bSJed Brown -fA <input_file> -fB <input_file> \n\n"; 5c4762a1bSJed Brown 6c4762a1bSJed Brown #include <petscmat.h> 7c4762a1bSJed Brown 8ad0e0ea3SStefano Zampini int main(int argc,char **args) 9c4762a1bSJed Brown { 10c4762a1bSJed Brown Mat A,B; 11c4762a1bSJed Brown PetscViewer fd; 12c4762a1bSJed Brown char file[2][PETSC_MAX_PATH_LEN]; 13c4762a1bSJed Brown PetscBool flg; 14c4762a1bSJed Brown PetscErrorCode ierr; 15c4762a1bSJed Brown PetscMPIInt size; 16c4762a1bSJed Brown PetscInt ma,na,mb,nb; 17c4762a1bSJed Brown 18c4762a1bSJed Brown ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 19ffc4695bSBarry Smith ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRMPI(ierr); 20*2c71b3e2SJacob Faibussowitsch PetscCheckFalse(size != 1,PETSC_COMM_WORLD,PETSC_ERR_SUP,"This is a uniprocessor example only!"); 21c4762a1bSJed Brown 22c4762a1bSJed Brown /* read the two matrices, A and B */ 23589a23caSBarry Smith ierr = PetscOptionsGetString(NULL,NULL,"-fA",file[0],sizeof(file[0]),&flg);CHKERRQ(ierr); 24*2c71b3e2SJacob Faibussowitsch PetscCheckFalse(!flg,PETSC_COMM_WORLD,PETSC_ERR_USER,"Must indicate binary file with the -fA options"); 25589a23caSBarry Smith ierr = PetscOptionsGetString(NULL,NULL,"-fB",file[1],sizeof(file[1]),&flg);CHKERRQ(ierr); 26*2c71b3e2SJacob Faibussowitsch PetscCheckFalse(!flg,PETSC_COMM_WORLD,PETSC_ERR_USER,"Must indicate binary file with the -fP options"); 27c4762a1bSJed Brown 28c4762a1bSJed Brown /* Load matrices */ 29c4762a1bSJed Brown ierr = PetscViewerBinaryOpen(PETSC_COMM_WORLD,file[0],FILE_MODE_READ,&fd);CHKERRQ(ierr); 30c4762a1bSJed Brown ierr = MatCreate(PETSC_COMM_WORLD,&A);CHKERRQ(ierr); 31c4762a1bSJed Brown ierr = MatLoad(A,fd);CHKERRQ(ierr); 32c4762a1bSJed Brown ierr = PetscViewerDestroy(&fd);CHKERRQ(ierr); 33c4762a1bSJed Brown printf("\n A:\n"); 34c4762a1bSJed Brown printf("----------------------\n"); 35c4762a1bSJed Brown ierr = MatView(A,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 36c4762a1bSJed Brown ierr = MatGetSize(A,&ma,&na);CHKERRQ(ierr); 37c4762a1bSJed Brown 38c4762a1bSJed Brown ierr = PetscViewerBinaryOpen(PETSC_COMM_WORLD,file[1],FILE_MODE_READ,&fd);CHKERRQ(ierr); 39c4762a1bSJed Brown ierr = MatCreate(PETSC_COMM_WORLD,&B);CHKERRQ(ierr); 40c4762a1bSJed Brown ierr = MatLoad(B,fd);CHKERRQ(ierr); 41c4762a1bSJed Brown ierr = PetscViewerDestroy(&fd);CHKERRQ(ierr); 42c4762a1bSJed Brown printf("\n B:\n"); 43c4762a1bSJed Brown printf("----------------------\n"); 44c4762a1bSJed Brown ierr = MatView(B,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 45c4762a1bSJed Brown ierr = MatGetSize(B,&mb,&nb);CHKERRQ(ierr); 46c4762a1bSJed Brown 47c4762a1bSJed Brown /* Compute B = -A + B */ 48*2c71b3e2SJacob Faibussowitsch PetscCheckFalse(ma != mb || na != nb,PETSC_COMM_SELF,PETSC_ERR_ARG_SIZ,"nonconforming matrix size"); 49c4762a1bSJed Brown ierr = MatAXPY(B,-1.0,A,DIFFERENT_NONZERO_PATTERN);CHKERRQ(ierr); 50c4762a1bSJed Brown printf("\n B - A:\n"); 51c4762a1bSJed Brown printf("----------------------\n"); 52c4762a1bSJed Brown ierr = MatView(B,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 53c4762a1bSJed Brown 54c4762a1bSJed Brown ierr = MatDestroy(&B);CHKERRQ(ierr); 55c4762a1bSJed Brown ierr = MatDestroy(&A);CHKERRQ(ierr); 56c4762a1bSJed Brown ierr = PetscFinalize(); 57c4762a1bSJed Brown return ierr; 58c4762a1bSJed Brown } 59