1 2 static char help[] = "Saves a dense matrix in a dense format (binary).\n\n"; 3 4 #include <petscmat.h> 5 6 int main(int argc,char **args) 7 { 8 Mat C; 9 PetscScalar v; 10 PetscInt i,j,m = 4,n = 4; 11 PetscErrorCode ierr; 12 PetscMPIInt rank,size; 13 PetscViewer viewer; 14 15 ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 16 ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr); 17 ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr); 18 ierr = PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);CHKERRQ(ierr); 19 ierr = PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);CHKERRQ(ierr); 20 21 /* PART 1: Generate matrix, then write it in binary format */ 22 23 /* Generate matrix */ 24 ierr = MatCreateSeqDense(PETSC_COMM_WORLD,m,n,NULL,&C);CHKERRQ(ierr); 25 for (i=0; i<m; i++) { 26 for (j=0; j<n; j++) { 27 v = i*m+j; 28 ierr = MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);CHKERRQ(ierr); 29 } 30 } 31 ierr = MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 32 ierr = MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 33 ierr = PetscViewerBinaryOpen(PETSC_COMM_WORLD,"matrix.dat",FILE_MODE_WRITE,&viewer);CHKERRQ(ierr); 34 ierr = MatView(C,viewer);CHKERRQ(ierr); 35 ierr = PetscViewerDestroy(&viewer);CHKERRQ(ierr); 36 ierr = MatDestroy(&C);CHKERRQ(ierr); 37 ierr = PetscFinalize(); 38 return ierr; 39 } 40 41 /*TEST 42 43 test: 44 45 TEST*/ 46