1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests MatMult() on MatLoad() matrix \n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown #include <petscmat.h> 5c4762a1bSJed Brown 6c4762a1bSJed Brown int main(int argc,char **args) 7c4762a1bSJed Brown { 8c4762a1bSJed Brown Mat A; 9c4762a1bSJed Brown Vec x,b; 10c4762a1bSJed Brown PetscViewer fd; /* viewer */ 11c4762a1bSJed Brown char file[PETSC_MAX_PATH_LEN]; /* input file name */ 12c4762a1bSJed Brown PetscBool flg; 13c4762a1bSJed Brown 14*9566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 15c4762a1bSJed Brown /* Determine file from which we read the matrix A */ 16*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetString(NULL,NULL,"-f",file,sizeof(file),&flg)); 1728b400f6SJacob Faibussowitsch PetscCheck(flg,PETSC_COMM_WORLD,PETSC_ERR_USER,"Must indicate binary file with the -f option"); 18c4762a1bSJed Brown 19c4762a1bSJed Brown /* Load matrix A */ 20*9566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,FILE_MODE_READ,&fd)); 21*9566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_WORLD,&A)); 22*9566063dSJacob Faibussowitsch PetscCall(MatLoad(A,fd)); 23c4762a1bSJed Brown flg = PETSC_FALSE; 24*9566063dSJacob Faibussowitsch PetscCall(VecCreate(PETSC_COMM_WORLD,&x)); 25*9566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetString(NULL,NULL,"-vec",file,sizeof(file),&flg)); 26c4762a1bSJed Brown if (flg) { 27c4762a1bSJed Brown if (file[0] == '0') { 28c4762a1bSJed Brown PetscInt m; 29c4762a1bSJed Brown PetscScalar one = 1.0; 30*9566063dSJacob Faibussowitsch PetscCall(PetscInfo(0,"Using vector of ones for RHS\n")); 31*9566063dSJacob Faibussowitsch PetscCall(MatGetLocalSize(A,&m,NULL)); 32*9566063dSJacob Faibussowitsch PetscCall(VecSetSizes(x,m,PETSC_DECIDE)); 33*9566063dSJacob Faibussowitsch PetscCall(VecSetFromOptions(x)); 34*9566063dSJacob Faibussowitsch PetscCall(VecSet(x,one)); 35c4762a1bSJed Brown } 36c4762a1bSJed Brown } else { 37*9566063dSJacob Faibussowitsch PetscCall(VecLoad(x,fd)); 38*9566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&fd)); 39c4762a1bSJed Brown } 40*9566063dSJacob Faibussowitsch PetscCall(VecDuplicate(x,&b)); 41*9566063dSJacob Faibussowitsch PetscCall(MatMult(A,x,b)); 42c4762a1bSJed Brown 43c4762a1bSJed Brown /* Print (for testing only) */ 44*9566063dSJacob Faibussowitsch PetscCall(MatView(A,0)); 45*9566063dSJacob Faibussowitsch PetscCall(VecView(b,0)); 46c4762a1bSJed Brown /* Free data structures */ 47*9566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 48*9566063dSJacob Faibussowitsch PetscCall(VecDestroy(&x)); 49*9566063dSJacob Faibussowitsch PetscCall(VecDestroy(&b)); 50*9566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 51b122ec5aSJacob Faibussowitsch return 0; 52c4762a1bSJed Brown } 53