Actual source code: ex43.c
1: /*$Id: ex43.c,v 1.19 2001/08/07 03:03:07 balay Exp $*/
3: static char help[] = "Saves a dense matrix in a dense format (binary).nn";
5: #include petscmat.h
7: int main(int argc,char **args)
8: {
9: Mat C;
10: PetscScalar v;
11: int i,j,ierr,m = 4,n = 4,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(PETSC_NULL,"-m",&m,PETSC_NULL);
18: PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
20: /* PART 1: Generate matrix, then write it in binary format */
22: /* Generate matrix */
23: MatCreateSeqDense(PETSC_COMM_WORLD,m,n,PETSC_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",PETSC_BINARY_CREATE,&viewer);
33: PetscViewerSetFormat(viewer,PETSC_VIEWER_BINARY_NATIVE);
34: MatView(C,viewer);
35: PetscViewerDestroy(viewer);
36: MatDestroy(C);
37: PetscFinalize();
38: return 0;
39: }