Actual source code: ex65.c


  2: static char help[] = "Saves a rectangular sparse matrix to disk.\n\n";

  4: #include <petscmat.h>

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

 13:   PetscInitialize(&argc,&args,(char*)0,help);
 14:   MatCreateSeqAIJ(PETSC_COMM_WORLD,m,n,20,0,&A);

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

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

 32:   PetscViewerBinaryOpen(PETSC_COMM_WORLD,"rect",FILE_MODE_WRITE,&view);
 33:   MatView(A,view);
 34:   PetscViewerDestroy(&view);

 36:   MatDestroy(&A);

 38:   PetscFinalize();
 39:   return 0;
 40: }

 42: /*TEST

 44:    test:

 46: TEST*/