/* test data */
proc plan ordered;
factors var1=2 var2=2 var3=3 / noprint;
output out=old;
run;
quit;
/* do something when we hit any first.var */
data new;
set old;
by var:;
array firsts(*) first:;
drop i;
do i = 1 to dim(firsts);
put firsts(i) 2. @;
end;
put;
run;
/* on log
1 1 1
0 0 1
0 0 1
0 1 1
0 0 1
0 0 1
1 1 1
0 0 1
0 0 1
0 1 1
0 0 1
0 0 1
*/
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