Actual source code: ex43.c
2: static char help[] = "Saves a dense matrix in a dense format (binary).\n\n";
4: #include <petscmat.h>
6: int main(int argc,char **args)
7: {
8: Mat C;
9: PetscScalar v;
10: PetscInt i,j,m = 4,n = 4;
11: PetscMPIInt rank,size;
12: PetscViewer viewer;
14: PetscInitialize(&argc,&args,(char*)0,help);
15: MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
16: MPI_Comm_size(PETSC_COMM_WORLD,&size);
17: PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);
18: PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
20: /* PART 1: Generate matrix, then write it in binary format */
22: /* Generate matrix */
23: MatCreateSeqDense(PETSC_COMM_WORLD,m,n,NULL,&C);
24: for (i=0; i<m; i++) {
25: for (j=0; j<n; j++) {
26: v = i*m+j;
27: MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);
28: }
29: }
30: MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
31: MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);
32: PetscViewerBinaryOpen(PETSC_COMM_WORLD,"matrix.dat",FILE_MODE_WRITE,&viewer);
33: MatView(C,viewer);
34: PetscViewerDestroy(&viewer);
35: MatDestroy(&C);
36: PetscFinalize();
37: return 0;
38: }
40: /*TEST
42: test:
44: TEST*/