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 PetscFunctionBeginUser; 18 PetscCall(PetscInitialize(&argc, &args, (char *)0, help)); 19 /* Load the matrix A */ 20 PetscCall(PetscOptionsGetString(NULL, NULL, "-f", file, sizeof(file), &flg)); 21 PetscCheck(flg, PETSC_COMM_WORLD, PETSC_ERR_USER, "Must indicate a file name for matrix A with the -f option."); 22 23 PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, file, FILE_MODE_READ, &viewer)); 24 PetscCall(MatCreate(PETSC_COMM_WORLD, &A)); 25 PetscCall(MatLoad(A, viewer)); 26 PetscCall(PetscViewerDestroy(&viewer)); 27 28 PetscCall(MatDuplicate(A, MAT_COPY_VALUES, &A1)); 29 PetscCall(MatDuplicate(A, MAT_COPY_VALUES, &A2)); 30 31 /* dstMat = A*A1*A2 */ 32 PetscCall(MatMatMult(A1, A2, MAT_INITIAL_MATRIX, fill, &Mtmp)); 33 PetscCall(MatMatMult(A, Mtmp, MAT_INITIAL_MATRIX, fill, &dstMat)); 34 PetscCall(MatDestroy(&Mtmp)); 35 36 /* dstMat += A1*A2 */ 37 PetscCall(MatMatMult(A1, A2, MAT_INITIAL_MATRIX, fill, &Mtmp)); 38 PetscCall(MatAXPY(dstMat, 1.0, Mtmp, SUBSET_NONZERO_PATTERN)); 39 PetscCall(MatDestroy(&Mtmp)); 40 41 /* dstMat += A*A1 */ 42 PetscCall(MatMatMult(A, A1, MAT_INITIAL_MATRIX, fill, &Mtmp)); 43 PetscCall(MatAXPY(dstMat, 1.0, Mtmp, SUBSET_NONZERO_PATTERN)); 44 PetscCall(MatDestroy(&Mtmp)); 45 46 /* dstMat += A */ 47 PetscCall(MatAXPY(dstMat, 1.0, A, SUBSET_NONZERO_PATTERN)); 48 49 PetscCall(MatDestroy(&A)); 50 PetscCall(MatDestroy(&A1)); 51 PetscCall(MatDestroy(&A2)); 52 PetscCall(MatDestroy(&dstMat)); 53 PetscCall(PetscFinalize()); 54 return 0; 55 } 56