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 PetscErrorCode ierr; 14 PetscReal fill=4.0; 15 char file[128]; 16 PetscBool flg; 17 18 ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 19 /* Load the matrix A */ 20 ierr = PetscOptionsGetString(NULL,NULL,"-f",file,sizeof(file),&flg);CHKERRQ(ierr); 21 if (!flg) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_USER,"Must indicate a file name for matrix A with the -f option."); 22 23 ierr = PetscViewerBinaryOpen(PETSC_COMM_WORLD,file,FILE_MODE_READ,&viewer);CHKERRQ(ierr); 24 ierr = MatCreate(PETSC_COMM_WORLD,&A);CHKERRQ(ierr); 25 ierr = MatLoad(A,viewer);CHKERRQ(ierr); 26 ierr = PetscViewerDestroy(&viewer);CHKERRQ(ierr); 27 28 ierr = MatDuplicate(A,MAT_COPY_VALUES,&A1);CHKERRQ(ierr); 29 ierr = MatDuplicate(A,MAT_COPY_VALUES,&A2);CHKERRQ(ierr); 30 31 /* dstMat = A*A1*A2 */ 32 ierr = MatMatMult(A1,A2,MAT_INITIAL_MATRIX,fill,&Mtmp);CHKERRQ(ierr); 33 ierr = MatMatMult(A,Mtmp,MAT_INITIAL_MATRIX,fill,&dstMat);CHKERRQ(ierr); 34 ierr = MatDestroy(&Mtmp);CHKERRQ(ierr); 35 36 /* dstMat += A1*A2 */ 37 ierr = MatMatMult(A1,A2,MAT_INITIAL_MATRIX,fill,&Mtmp);CHKERRQ(ierr); 38 ierr = MatAXPY(dstMat,1.0,Mtmp,SUBSET_NONZERO_PATTERN);CHKERRQ(ierr); 39 ierr = MatDestroy(&Mtmp);CHKERRQ(ierr); 40 41 /* dstMat += A*A1 */ 42 ierr = MatMatMult(A,A1,MAT_INITIAL_MATRIX,fill,&Mtmp);CHKERRQ(ierr); 43 ierr = MatAXPY(dstMat, 1.0, Mtmp,SUBSET_NONZERO_PATTERN);CHKERRQ(ierr); 44 ierr = MatDestroy(&Mtmp);CHKERRQ(ierr); 45 46 /* dstMat += A */ 47 ierr = MatAXPY(dstMat, 1.0, A,SUBSET_NONZERO_PATTERN);CHKERRQ(ierr); 48 49 ierr = MatDestroy(&A);CHKERRQ(ierr); 50 ierr = MatDestroy(&A1);CHKERRQ(ierr); 51 ierr = MatDestroy(&A2);CHKERRQ(ierr); 52 ierr = MatDestroy(&dstMat);CHKERRQ(ierr); 53 ierr = PetscFinalize(); 54 return ierr; 55 } 56 57