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5 REPLIES 5
PGStats
Opal | Level 21

If you mean to read a dataset in reverse order, backwards from the end, here is one way:

 

data ssalc;
set sashelp.class(obs=1) nobs=nobs;
do i = nobs to 1 by -1;
    set sashelp.class point=i;
    output;
    end;
drop i;
run;
PG
WarrenKuhfeld
Rhodochrosite | Level 12

Since NOBS=NOBS is taken care of at compile time, here is an alternative to @PGStats code.

 

data ssalc(drop=i);
   do i = nobs to 1 by -1;
      set sashelp.class point=i nobs=nobs;
      output;
   end;
   stop;
run;

 

PGStats
Opal | Level 21

Test it! I did.

 

It will work because it will hit the obs=1 limit after the first iteration. It's just another way to avoid an infinite loop.

PG
WarrenKuhfeld
Rhodochrosite | Level 12

Sorry @PGStats, I stand corrected.  I will update that post.

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