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 8d71ae5a4SJacob Faibussowitsch int main(int argc, char **args) 9d71ae5a4SJacob Faibussowitsch { 10c4762a1bSJed Brown Mat A, B; 11c4762a1bSJed Brown PetscViewer fd; 12c4762a1bSJed Brown char file[2][PETSC_MAX_PATH_LEN]; 13c4762a1bSJed Brown PetscBool flg; 14c4762a1bSJed Brown PetscMPIInt size; 15c4762a1bSJed Brown PetscInt ma, na, mb, nb; 16c4762a1bSJed Brown 17327415f7SBarry Smith PetscFunctionBeginUser; 18*c8025a54SPierre Jolivet PetscCall(PetscInitialize(&argc, &args, NULL, help)); 199566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 20be096a46SBarry Smith PetscCheck(size == 1, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, "This is a uniprocessor example only!"); 21c4762a1bSJed Brown 22c4762a1bSJed Brown /* read the two matrices, A and B */ 239566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetString(NULL, NULL, "-fA", file[0], sizeof(file[0]), &flg)); 2428b400f6SJacob Faibussowitsch PetscCheck(flg, PETSC_COMM_WORLD, PETSC_ERR_USER, "Must indicate binary file with the -fA options"); 259566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetString(NULL, NULL, "-fB", file[1], sizeof(file[1]), &flg)); 2628b400f6SJacob Faibussowitsch PetscCheck(flg, PETSC_COMM_WORLD, PETSC_ERR_USER, "Must indicate binary file with the -fP options"); 27c4762a1bSJed Brown 28c4762a1bSJed Brown /* Load matrices */ 299566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, file[0], FILE_MODE_READ, &fd)); 309566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_WORLD, &A)); 319566063dSJacob Faibussowitsch PetscCall(MatLoad(A, fd)); 329566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&fd)); 33c4762a1bSJed Brown printf("\n A:\n"); 34c4762a1bSJed Brown printf("----------------------\n"); 359566063dSJacob Faibussowitsch PetscCall(MatView(A, PETSC_VIEWER_STDOUT_WORLD)); 369566063dSJacob Faibussowitsch PetscCall(MatGetSize(A, &ma, &na)); 37c4762a1bSJed Brown 389566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, file[1], FILE_MODE_READ, &fd)); 399566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_WORLD, &B)); 409566063dSJacob Faibussowitsch PetscCall(MatLoad(B, fd)); 419566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&fd)); 42c4762a1bSJed Brown printf("\n B:\n"); 43c4762a1bSJed Brown printf("----------------------\n"); 449566063dSJacob Faibussowitsch PetscCall(MatView(B, PETSC_VIEWER_STDOUT_WORLD)); 459566063dSJacob Faibussowitsch PetscCall(MatGetSize(B, &mb, &nb)); 46c4762a1bSJed Brown 47c4762a1bSJed Brown /* Compute B = -A + B */ 48e00437b9SBarry Smith PetscCheck(ma == mb && na == nb, PETSC_COMM_SELF, PETSC_ERR_ARG_SIZ, "nonconforming matrix size"); 499566063dSJacob Faibussowitsch PetscCall(MatAXPY(B, -1.0, A, DIFFERENT_NONZERO_PATTERN)); 50c4762a1bSJed Brown printf("\n B - A:\n"); 51c4762a1bSJed Brown printf("----------------------\n"); 529566063dSJacob Faibussowitsch PetscCall(MatView(B, PETSC_VIEWER_STDOUT_WORLD)); 53c4762a1bSJed Brown 549566063dSJacob Faibussowitsch PetscCall(MatDestroy(&B)); 559566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 569566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 57b122ec5aSJacob Faibussowitsch return 0; 58c4762a1bSJed Brown } 59