Actual source code: ex6.c

petsc-3.5.4 2015-05-23
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  2: static char help[] = "Tests ISComplement().\n\n";

  4: #include <petscis.h>
  5: #include <petscviewer.h>

  9: int main(int argc,char **argv)
 10: {
 11:   PetscMPIInt    rank,size;
 12:   PetscInt       i,j,n,cnt=0,rstart,rend,*indices;
 13:   IS             is,isc;

 16:   PetscInitialize(&argc,&argv,(char*)0,help);
 17:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 18:   MPI_Comm_size(PETSC_COMM_WORLD,&size);

 20:   n      = 3*size;              /* Number of local indices, same on each process. */
 21:   rstart = 3*(size+2)*rank;     /* start of local range */
 22:   rend   = 3*(size+2)*(rank+1); /* end of local range */
 23:   PetscMalloc1(n,&indices);
 24:   for (i=0; i<3; i++) {
 25:     for (j=0; j<size; j++) indices[cnt++] = rstart+i*(size+2)+j;
 26:   }
 27:   if (cnt != n) SETERRQ(PETSC_COMM_SELF,1,"inconsistent count");
 28:   ISCreateGeneral(PETSC_COMM_WORLD,n,indices,PETSC_COPY_VALUES,&is);
 29:   PetscFree(indices);
 30:   ISComplement(is,rstart,rend,&isc);
 31:   ISView(is,PETSC_VIEWER_STDOUT_WORLD);
 32:   ISView(isc,PETSC_VIEWER_STDOUT_WORLD);

 34:   ISDestroy(&is);
 35:   ISDestroy(&isc);
 36:   PetscFinalize();
 37:   return 0;
 38: }