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 PetscMPIInt size; 15c4762a1bSJed Brown PetscInt ma,na,mb,nb; 16c4762a1bSJed Brown 17*9566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 18*9566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 192c71b3e2SJacob Faibussowitsch PetscCheckFalse(size != 1,PETSC_COMM_WORLD,PETSC_ERR_SUP,"This is a uniprocessor example only!"); 20c4762a1bSJed Brown 21c4762a1bSJed Brown /* read the two matrices, A and B */ 22*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetString(NULL,NULL,"-fA",file[0],sizeof(file[0]),&flg)); 2328b400f6SJacob Faibussowitsch PetscCheck(flg,PETSC_COMM_WORLD,PETSC_ERR_USER,"Must indicate binary file with the -fA options"); 24*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetString(NULL,NULL,"-fB",file[1],sizeof(file[1]),&flg)); 2528b400f6SJacob Faibussowitsch PetscCheck(flg,PETSC_COMM_WORLD,PETSC_ERR_USER,"Must indicate binary file with the -fP options"); 26c4762a1bSJed Brown 27c4762a1bSJed Brown /* Load matrices */ 28*9566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,file[0],FILE_MODE_READ,&fd)); 29*9566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_WORLD,&A)); 30*9566063dSJacob Faibussowitsch PetscCall(MatLoad(A,fd)); 31*9566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&fd)); 32c4762a1bSJed Brown printf("\n A:\n"); 33c4762a1bSJed Brown printf("----------------------\n"); 34*9566063dSJacob Faibussowitsch PetscCall(MatView(A,PETSC_VIEWER_STDOUT_WORLD)); 35*9566063dSJacob Faibussowitsch PetscCall(MatGetSize(A,&ma,&na)); 36c4762a1bSJed Brown 37*9566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,file[1],FILE_MODE_READ,&fd)); 38*9566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_WORLD,&B)); 39*9566063dSJacob Faibussowitsch PetscCall(MatLoad(B,fd)); 40*9566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&fd)); 41c4762a1bSJed Brown printf("\n B:\n"); 42c4762a1bSJed Brown printf("----------------------\n"); 43*9566063dSJacob Faibussowitsch PetscCall(MatView(B,PETSC_VIEWER_STDOUT_WORLD)); 44*9566063dSJacob Faibussowitsch PetscCall(MatGetSize(B,&mb,&nb)); 45c4762a1bSJed Brown 46c4762a1bSJed Brown /* Compute B = -A + B */ 472c71b3e2SJacob Faibussowitsch PetscCheckFalse(ma != mb || na != nb,PETSC_COMM_SELF,PETSC_ERR_ARG_SIZ,"nonconforming matrix size"); 48*9566063dSJacob Faibussowitsch PetscCall(MatAXPY(B,-1.0,A,DIFFERENT_NONZERO_PATTERN)); 49c4762a1bSJed Brown printf("\n B - A:\n"); 50c4762a1bSJed Brown printf("----------------------\n"); 51*9566063dSJacob Faibussowitsch PetscCall(MatView(B,PETSC_VIEWER_STDOUT_WORLD)); 52c4762a1bSJed Brown 53*9566063dSJacob Faibussowitsch PetscCall(MatDestroy(&B)); 54*9566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 55*9566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 56b122ec5aSJacob Faibussowitsch return 0; 57c4762a1bSJed Brown } 58