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).\n\n";
5: #include petscmat.h
9: int main(int argc,char **args)
10: {
11: Mat C;
12: PetscScalar v;
13: int i,j,ierr,m = 4,n = 4,rank,size;
14: PetscViewer viewer;
16: PetscInitialize(&argc,&args,(char *)0,help);
17: MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
18: MPI_Comm_size(PETSC_COMM_WORLD,&size);
19: PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);
20: PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
22: /* PART 1: Generate matrix, then write it in binary format */
24: /* Generate matrix */
25: MatCreateSeqDense(PETSC_COMM_WORLD,m,n,PETSC_NULL,&C);
26: for (i=0; i<m; i++) {
27: for (j=0; j<n; j++) {
28: v = i*m+j;
29: MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);
30: }
31: }
32: MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
33: MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);
34: PetscViewerBinaryOpen(PETSC_COMM_WORLD,"matrix.dat",PETSC_FILE_CREATE,&viewer);
35: PetscViewerSetFormat(viewer,PETSC_VIEWER_BINARY_NATIVE);
36: MatView(C,viewer);
37: PetscViewerDestroy(viewer);
38: MatDestroy(C);
39: PetscFinalize();
40: return 0;
41: }