1 2 static char help[] = "Tests sequential and parallel MatMatMult() and MatAXPY(...,SUBSET_NONZERO_PATTERN) \n\ 3 Input arguments are:\n\ 4 -f <input_file> : file to load\n\n"; 5 /* e.g., mpiexec -n 3 ./ex113 -f <file> */ 6 7 #include <petscmat.h> 8 9 int main(int argc,char **args) 10 { 11 Mat A,A1,A2,Mtmp,dstMat; 12 PetscViewer viewer; 13 PetscReal fill=4.0; 14 char file[128]; 15 PetscBool flg; 16 17 PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 18 /* Load the matrix A */ 19 PetscCall(PetscOptionsGetString(NULL,NULL,"-f",file,sizeof(file),&flg)); 20 PetscCheck(flg,PETSC_COMM_WORLD,PETSC_ERR_USER,"Must indicate a file name for matrix A with the -f option."); 21 22 PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,FILE_MODE_READ,&viewer)); 23 PetscCall(MatCreate(PETSC_COMM_WORLD,&A)); 24 PetscCall(MatLoad(A,viewer)); 25 PetscCall(PetscViewerDestroy(&viewer)); 26 27 PetscCall(MatDuplicate(A,MAT_COPY_VALUES,&A1)); 28 PetscCall(MatDuplicate(A,MAT_COPY_VALUES,&A2)); 29 30 /* dstMat = A*A1*A2 */ 31 PetscCall(MatMatMult(A1,A2,MAT_INITIAL_MATRIX,fill,&Mtmp)); 32 PetscCall(MatMatMult(A,Mtmp,MAT_INITIAL_MATRIX,fill,&dstMat)); 33 PetscCall(MatDestroy(&Mtmp)); 34 35 /* dstMat += A1*A2 */ 36 PetscCall(MatMatMult(A1,A2,MAT_INITIAL_MATRIX,fill,&Mtmp)); 37 PetscCall(MatAXPY(dstMat,1.0,Mtmp,SUBSET_NONZERO_PATTERN)); 38 PetscCall(MatDestroy(&Mtmp)); 39 40 /* dstMat += A*A1 */ 41 PetscCall(MatMatMult(A,A1,MAT_INITIAL_MATRIX,fill,&Mtmp)); 42 PetscCall(MatAXPY(dstMat, 1.0, Mtmp,SUBSET_NONZERO_PATTERN)); 43 PetscCall(MatDestroy(&Mtmp)); 44 45 /* dstMat += A */ 46 PetscCall(MatAXPY(dstMat, 1.0, A,SUBSET_NONZERO_PATTERN)); 47 48 PetscCall(MatDestroy(&A)); 49 PetscCall(MatDestroy(&A1)); 50 PetscCall(MatDestroy(&A2)); 51 PetscCall(MatDestroy(&dstMat)); 52 PetscCall(PetscFinalize()); 53 return 0; 54 } 55