移动式提取数据集中20个数据作为新的数据集！怎么做？

Using a group variable to indicate a data group is much better idea than outputting data to many data sets.

Here is an example,

data t1;
  do ord=1 to 31;
     x=ranuni(123);
         output;
  end;
run;

data t2;
  do group=1 to nobs-20+1;
     do pts=group to group+(20-1);
     set t1 point=pts nobs=nobs;
         output;
     end;
   end;
  stop;
run;

proc print;run;

谢谢大家帮忙，搞定啦