Actual source code: ex6.c

petsc-3.13.4 2020-08-01
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  2: static char help[] = "Tests ISComplement().\n\n";

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

  7: int main(int argc,char **argv)
  8: {
  9:   PetscMPIInt    rank,size;
 10:   PetscInt       i,j,n,cnt=0,rstart,rend,*indices;
 11:   IS             is,isc;

 14:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
 15:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 16:   MPI_Comm_size(PETSC_COMM_WORLD,&size);

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

 32:   ISDestroy(&is);
 33:   ISDestroy(&isc);
 34:   PetscFinalize();
 35:   return ierr;
 36: }


 39: /*TEST

 41:    test:
 42:       suffix: 3
 43:       nsize: 3

 45: TEST*/