Actual source code: ex65.c

  1: /*$Id: ex65.c,v 1.15 2001/08/07 21:30:08 bsmith Exp $*/

  3: static char help[] = "Saves a rectangular sparse matrix to disk.nn";

 5:  #include petscmat.h

  7: int main(int argc,char **args)
  8: {
  9:   Mat         A;
 10:   int         m = 100,n = 11,ierr,js[11],i,j,cnt;
 11:   PetscScalar values[11];
 12:   PetscViewer view;

 14:   PetscInitialize(&argc,&args,(char *)0,help);

 16:   MatCreateSeqAIJ(PETSC_COMM_WORLD,m,n,20,0,&A);

 18:   for (i=0; i<n; i++) values[i] = (PetscReal)i;

 20:   for (i=0; i<m; i++) {
 21:     cnt = 0;
 22:     if (i % 2) {
 23:       for (j=0; j<n; j += 2) {
 24:         js[cnt++] = j;
 25:       }
 26:     } else {
 27:       ;
 28:     }
 29:     MatSetValues(A,1,&i,cnt,js,values,INSERT_VALUES);
 30:   }
 31:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 32:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

 34:   PetscViewerBinaryOpen(PETSC_COMM_WORLD,"rect",PETSC_BINARY_CREATE,&view);
 35:   MatView(A,view);
 36:   PetscViewerDestroy(view);

 38:   MatDestroy(A);

 40:   PetscFinalize();
 41:   return 0;
 42: }